Hi,
I have psoriatic arthritis too. I am 35 now, has PA since I was 21. Mostly in hands, wrists, ankles and feet but also general all over stiffness and pain.
We had quite a lot of fertility problems (we think due to my overactive immune system) and I was treated with steroids and IV IViG from 2 weeks - 32 weeks pg. My arthritis went into complete remission when I was pg and only returned when my DTs were about 5 months old. Prior to ttc (which took us 6 years, so I was a long time off the drugs) I was on sulphasalazine - but it didn't seem to help much. I used a lot of painkillers (though sometimes they didn't touch it), wrist and finger splints and relied on my wonderful DH.
Now, I'm still bf and on Naproxen, 30/500 co-codamol (I restrict these to 4 per day as they are addictive, and try to take paracetamol instead if I can). My PA is active and causing joint damage, especially in my feet and hands. My specialist says methotrexate might help but I need to stop bf before I can have it. So I'm trying to bf the boys to 1 year and then weaning them off and starting the drugs.
It's really hard to deal with the pain, I imagine it would be hard for your DH with your 2 year old needing to be picked up, strapped into car seat etc.
On a practical note, we got the Kiddi Comfort car seats for the boys - they work on the seat belt so much easier for arthritic fingers to manage.
Sorry I've rambled - is that any help?