Hi:
I always thought men had their mlcs at 40 and women at 30!
If you haven't purchased your "toy" (Covette, big boat, airplane), you're not having a midlife crisis
But seriously, it sounds like you're in a rut (I passed 30 20 years ago). You sound like you're looking for, to use a buzzword, "validation". For some reason you're dissatisfied with the way things are in your life and may be playing "what-if" by connecting with someone from the past.
You're realized by now that things move on--things in the past don't stay on some course that they may have taken all those years ago. I have no problem with having a "crush" on someone so long as I keep it to myself and DO NOT act on it. It's so nice when someone else thinks that I'm cool and says so--I haven't heard it from my spouse in years.
As far as getting off the meds go, not a good idea. A couple of years ago my primary care MD took me off an AD and over the next few months my life spun out of control. I actually didn't realize it until I had a major meltdown (at home). I was lucky enough to get to see a mental health professional and got squared away. If the med(s) your on don't seem to be working or the side effects are worse than the condition then talk to the person who prescribed them. There are all kinds of meds, either new ones or old ones that have applications that are related to depression.
I'm sorry you're feeling so down. There is such a thing as "Seasonal Affective Disorder" (SAD). More often it happens when the days are short (I get it from September through March). It's possible you have SAD but a mental health professional needs to help you on that.
Is there anything at all that excites you, something you've always wanted to do? I've recently gotten into container gardening (window boxes). It isn't much, I realize but it makes me happy. I'm considering getting into climbing roses next year (we have latticework along the side of where we live). I don't know why, there's just this irresistible thing pushing me. One never knows where a path will lead.
Melissa is a smart person--what she says is very sound. Please consider going back on the meds or talking to a mental health professional.
Good luck!