Munchroom you must NEVER feel like you are a let down!!! Look at what you have done recently! You have been working quite a lot, been on a meds course, you have really helped a lot of people on here - me in particular, you have been seeing friends, you have been on a train, you have hosted the party of the year at your house, and from the sounds of it catered it pretty fantastically too!!!!! WILL YOU PACK IT IN!!!!!!!!!!???? The only thing you are guilty of is doing a bit too well recently and frankly freaked yourself the hell out a little bit! Is it ANY wonder? You have been doing really really well and now you're a bit pooped! Be proud, understand your body, understand your condition, put two and two together and realise that if you run a marathon, no matter how hard you have trained for it, you will still be exhausted.
It is ok to do too much and feel a bit put back, as long as you expect the trade off. Just like if you drink a bit too much you're going to have a hang over; if on the night you're just having a blast, you have a think about the trade off and decide the hangover will be worth the good time and you make the choice. Don't you dare go to your doctor tomorrow and NOT tell him all the wonderful 'normal' stressful things you have been enduring recently.
You have been doing really really well. This is only a temporary feeling, it will pass. Be proud not disappointed.
I was saying to Zaf yesterday, dark thoughts are normal, they are just exploration, nothing to worry about. Let us know if it ever gets more than that.