Majormoo, I can't imagine how "up in the air" you must be feeling. I agree with the others though, I would get in at the GP and ask for quantative bloods to check your levels.
Carolyn, I breatfed both my boys. DS1 was breastfed exclusively for 8 weeks then mixed fed (breast/bottle) for another 8 weeks before he swapped exclusively to the bottle. He also had dummy's, so a sterilizer was a must (although cold water sterilising works just as well, no fancy gadgets needed for that, a container of some kind, a tablets or liquid and something like a plate to hold the stuff under the water, lol!)
DS2 was exclusively breastfeed until he finally started solids at 8 months and continued to mainly fed at the breast with little bits of food until he was 15 months. I carried on feednig him for a long time, but our circumstances were very different to the norm. He never took to a bottle or a dummy, but as he was poorly and on meds, he had a lot of medical syringes, so the steriliser was still useful.
I don't have the sterilser anymore, we worse it out, lol! I guess I may have to get a new one, they do come in handy whether you breastfeed or not. Not sure if I should get a mircrowave one or a cold water one though!