Ok so I feel really embarassed asking ... but just want to know if I am normal or not...

during my 1st TM I was aroused all the time and pretty much wanted as much sex as possible (in between puking) .... but now I am in my 2nd and I'm tired/cranky and don't want it at all - then i feel guily because I know DF is climbing the walls.
The other prob is that when I do feel like it (not just as maintenance for DF) I find it really difficult to climax which I've never had a problem with before.
I'm so sorry if this is way TMI but I'd love to know if anyone else is/ has experienced the same thing and if they know anyway around it... DF is being very understanding but I am beating myself up over it

Thanks in advance all