Sounds very familiar! I had no M/S and put on no weight until just recently; usually women with M/S lose weight, so when they put it on it's just getting back to "normal". As for my bladder, I hate that - I really hate the "bladder dance" if someone is using our one loo at work (I share a loo with 5 consultants, 5 other PAs and about 20 other doctors). I've put on about 3kg in the last 6 weeks though, so you'll start shooting up soon enough! Many girls don't gain any weight - you didn't say how big you were to start with, but I was "tiny" at the beginning and DH was very worried about my lack of weight gain at 3m, let alone now!

Headaches are not bad, nor is occasional blurred vision - this is your pituitary gland growing as it tells the body to get ready to lactate (produce milk). If you had a brain scan it would show that it has grown quite a bit, but because your head doesn't grow with it then it starts pressing on various bits of the brain and the optic chiasm, so your vision may get a bit worse. The headaches will go away once the brain is used to what's going on and your gland will shrink back to "normal" once your baby is weaned.