doom, you need to see your doctor about this, now. For me it was bad enough that things I would really enjoy doing, I just didn't find them enjoyable at all. I had a LOT of trouble sleeping, was ALWAYS tired as a result. I missed quite a bit of work as well due just unable to bring myself to do anything, and me being so damn tired all the time. I cannot afford to have my SA severely hampered, not my job. Doctor kept asking me how things were going but I avoided the issue for several months before I finally just told him what was going on. That is when he diagnosed me with depression. I am currently taking Wellbutrin for it, and for me, things are looking a LOT better. I'm enjoying things again, I'm getting sleep. Can't seem to cut grass anymore though as I break out in a rash. Didn't have this issue prior to taking Wellbutrin (though I do have an allergy of grass), but other than that things are golden compared to what they were before.
You can take some of the suggestions that people have given you here, but ONLY after you have talked to your doctor. You have to tell him what all of the symptoms you are going through, no matter how minor. If your doc is worth his weight in salt, he'll start to ask you questions pertaining to your life and job in detail. Answer honestly and give as much detail as you can. If you are prescribed anything, make sure to ask questions, especially about the side effects. For me I had to make sure that it wouldn't affect my driving. Also, if anything unusual starts happening when taking the medication, talk to your doctor IMMEDIATELY. Originally my doctor prescribed Paxil, but after a day hands started shaking. After a week, I was having the shakes real bad, so I went to see my doctor about it. He told me to stop taking Paxil immediately. Turns out that if I had kept taking it, it would have eventually affected my brain. I don't hold fault with him though. He didn't know I'd react in such a manner, nor did I. He started me on a light dose of it to play it safe, and it's a good thing he did. A heavier dose may have been very bad for me.
Talk do your doctor as soon as you can, don't ignore it.