Hello and welcome Cuckoo. I'm sorry that ttc has been such an ordeal for you, it really is difficult.
Like Irishmammmy I have had to be sneaky about ovulation too, my DH has no idea of my cycle.I keep it very quiet, so that when it is time for DTD he isn't put off. But my reasoning is a little different - my DH doesn't want to ttc, but if it happens, will be okay about a baby. I have heard of other women having the same issues,and also having their DH's use viagra - with success, so I hope that helps you.
As for the life of sperm, I know for a fact that sperm will survive for about 30 minutes if it is kept at body temperature. My DH had a vasectomy reversal (and we've got a 3 year old son as a result, me at age 41) and had to have a sperm sample analysed. He ejaculated, collected the sample in a specimen jar,and I placed it under my bra to keep it warm because I had to drive 20 minutes to the lab. He got a very good result, so I'm guessing the sperm survived well.
Goth it is perfectly normal to feel crap when AF shows. Especially as we're on an emotional rollercoaster of highs and lows. After AF we feel hopeful because ovulation is coming, we prepare mentally for that, shag as much as possible (despite what seems like the whole universe conspiring against the opportunity to have sex - illness, injury, children's needs, tiredness, over-work, etc,etc), then feel hopeful and notice symptoms, or feel hopeless one day and hopeful the next, then getting BFN's, but still hoping for a late BFP then AF finding us. It really is hard, and when you do it month after month, it can be quite disheartening.
I've been ttc since DS was ten months old - but had to wait another 8 months or so for my fertility to return. I've been pregnant three times since then, losing two of them at about 10 weeks, and one, more recently at about 5 weeks. I sometimes can't believe that I'd get back up and try again, with the odds against me, but I always feel there is a glimmer of hope, even if it is tiny, it's still there, and I truly believe that eventually, the right egg will come along - they won't all be totally useless.
It really does help to have supportive online friends (no one in RL really understands why on earth I'd try again at my age and when I already have 5 kids, but I just feel I have to have one more to complete my family). Even my doctor said that when my "case" was discussed at the practice the other doctors couldn't understand why I'd keep trying. I don't think doctors are all that compassionate. My doctor does seem to sympathise, but it does hurt to hear that the others in her practice think I'm loopy for wanting a baby.Most of my RL friends are loving that their children have grown up and are flying the coop- they talk about having loads of time to themselves and travel etc, but I just don't feel the same way.
Sorry about the long post(that's if you've managed to get to the end).Where there's life there's hope - I really believe that.