Kazza you sound like my mum too 
Amen I remember when I last split with someone, it did feel really weird being single for a while. I agree with Kazza that you need to keep busy and make every effort you possibly can to get in touch with old friends you may have let drift while you had a partner (yes we all do it...). And do everything you can to cultivate new friendships, anyone you get on at all with at work, see if they fancy seeing a film with you one night, etc...
Kazza I've seen my GP now - it was a really good appointment actually - he was really helpful. And I did bring up the big 'O' issue (after a bit of stuttering around the actual word!). He said he's really happy with how I'm doing and I am clearly a lot better. He said I definitely don't need a higher dose, and I should continue to feel better and better, just on the dose I am on.
It was all a bit technical for my slightly fried brain, but he was saying that the meds increase serotonin to such a level that they inhibit the stress' signals' your brain has got into the habit of whizzing around constantly, which make you feel so anxious. They kind of 'block' those signals a bit, and the idea is that over time, your brain makes new connections in your thought patterns, bypassing the horrible stress ones. So when you eventually come off the meds, those connections (hopefully) carry on working that way and you continue to feel well, without the meds.
He actually said he was happy for me to experiment with the dose if I wanted to, particularly with regards to my 'O' problems - and that going down to 25mg may well be enough for me to still feel ok but for the 'O' side effects to go. I said I would be a bit worried about cutting down so soon, and he agreed that maybe I should stick with 50mg for a few more weeks/months then to try cutting down when I feel ready to.
I was asking him more generally about dosage, as in what is a standard dose and why would somebody need a higher one. He said 50mg is generally considered the standard dose which should be effective for the majority of people. He said he would go up to 100mg with somebody who had seen some improvement on 50mg but not enough of an improvement to have an impact on their overall quality of life. He also said some GPs would prescribe higher doses, 150mg or 200mg, but that in his opinion there's not much evidence of that being effective and that a different AD altogether may suit that person.
Sorry for the mammoth post - but feeling very positive now and thought what he said about dosage may be of interest.....