redclover - you sound like an inspirational lady! I think it is brilliant that you volunteer with Princes Trust and Social Services.
There is just something about your post that made me want to try and share as many ideas as I can.
I think that you've come to the right place to get advice.
I lurk much more than I post but I've found the internet to be very useful to research all things PG/parenting. (I have one DS who is 2.3 years old.)
You definitely need expert advice re the use of your pain medication - the default advice can often be no meds during pregnancy. GPs and your hospital specialists won't be experts in this field as they are not obs/gyn or paeds.
Have you considered a private medical consultation with an expert - not sure how you'd go about finding one.
I think that if I was in your position I would have several strands of research on the go as follows:
Surrogacy
Have you seen the COTS website - here?
Adoption
There is an adoption section of Mumsnet - here.
I am wondering whether you would be unlikely to be offered a child for adoption due to concerns about your health.
Remaining child free
I am aware of various forums for people who have decided to be "child free by choice" or who are unable to conceive.
These are some places where I lurked before my DH agreed to TTC.
I think that it is worth considering this possibility and what would be positive about it and what life experiences it would allow (more volunteering/travel/time as a couple etc).
One child families
Obviously if you do go ahead to TTC then having one child may be easier to manage-
see the one child board - here - there are many positive experiences there.
I lurk as DH adament he wants no more DCs.
Conception
With regards to TTC - I would think that it would be of benefit to you if you could conceive ASAP after you came off your meds.
Therefore I would suggest that you get very familiar with the details of how your cycles work - i.e. temp taking/cervical mucas/
/ovulation tests.
I can recommend this
book - I used it and conceived first try!
I can also recommend the Zita West books she talks through health for fertility vitamins etc - I believe her consultations are higly recommended by many- may be good to get someone real life to discuss TTC with.
Accupunture which others have mentioned is good for fertility.
I did a Hypnobirthing course as I was really anxious about giving birth - I can really recommend it. I had a fast labour and relatively straight forward labour with gas and air for pushing stage.
Hypnotherapy in general may be of use to you in your relaxation programme - I have several downloads from here.
Other thoughts - What contraception are you currently on? If it is one which generally takes a while for full fertility to resume could you come off it and move to non-hormonal eg Condoms plus Diaphragm plus Charting.
Maybe your DH could have a sperm count test done to confirm all is OK with him before you proceed.
Could you maybe find out if you could use IVF or ICSI (don't know much about these) - I wonder if it would increase the chances in an individual cycle.
It may be worth finding out if you could use certain meds at the beginning of each cycle if you have confirmed you are not PG?
Thoughts about managing a baby
I'd recommend that you research Birth support - google doulas.
A part time nanny/au pair/ mother's help would be very helpful to you - could you afford for this - do you need to start budgeting?
Start to research breastfeeding - I wish I had done more before my DS is born. Basically because in this country
we are not surrounded by generations of breastfeeding women we have culturally lost a lot of the know how.
There are people on the breastfeeding board here on Mumsnet who are very clued up about where to find out about
what meds are ok for breastfeeding.
Routines for baby etc - not for everyone - and I agree that ideally biologically these are not "natural". And despite believing that on-demand breastfeeding/co-sleeping was best it wasn't possible for me so I eased my DS into a routine - and certainly a Nanny could help with this - I recommend that you look into both routines AND Attachment parenting.
As for managing a baby - I really believe that you can shape how a baby develops/increase concentration levels -
many of the ways of doing this are not "mainstream" and different to want most folk do (less plastic toys, less TV etc!!).
Generally Mumsnet won't be the best place for this info .
I'd like to recommend - this
book - Montessori from the start - and also have a look at Montessori infant and toddler
info and blogs. I really like some of the principals and I find the various activities really calm my DS.
My reason for posting this was so that you could be more confident of raising a child who fits in with your life and who would grow up to be able to occupy themselves happily when needed.
Good luck with everything and apologies for the masssive post.