I have one child and I noticed alot of those things after she was born...I lost about a third of the wieght I'd gained with her by the time she was 4....and then I got pregnant again...and now this time I'm having problems losing the weight I gained in the three months I was pregnant...I was always a skinny person....I know that miscarriages really affect our bodies. I've heard that you are supposed to be extremely fertile right after the miscarriage- during the time you are not supposed to try...I know that stress can affect your ability to get pregnant too. I would try a new doctor and stop "trying" to get pregnant...just don't use protection...The emotions of trying each month and not getting the results you want can definately effect your stress level...
Good luck