Chulita - completely agree about the sore bits this time round, and I was a total nympho the first time!!! Dh can't help but feel a little disappointed, but I don't blame him.
DH Hobby is definitely the way forward. This time with DS pregnancy I was just like you, I even convinced myself dh was having an affair with his head of dept (she's 35yrs our senior and actually a bit batty, not sure what I was thinking now) although it does sound like you've found a more realistic target for your fears.
This time around I'm so busy with planning house move and caring for DS I don't have time to do anything else and I just want to sleep, so if dh wants to go out with people from work I breath a sigh of relief and retire to the bath for the evening!!
The one thing DH always says is that no matter how much he loved me before DS, it is times a million since I had DS I think the impact DC can have on our dh's shouldn't be under-rated. Try not to worry. Paranoid wife is not as endearing as a trusting one.
I would get your fears out in the open though. When we were about 14 wks pg I lost it with dh and told him how much I resented being pg because I wanted to adopt and I'd done this for him and it was horrendous. He accepted it, apologised and said he'd try to support me more (which he has), but tbh, once I'd said it out loud, it felt a bit silly and I ended up apologising the next day.
I think speaking out our resentment/anger etc... helps us to evaluate in RL and decide whether it's just hormonal or a valid point. Hopefully your dh will be understanding if you do need to apologise for your hormonal rant later.
Sorry about the stupidly long post!