I also have some mild depression--not enough to lose all interest in everything, but enough for my sense of meaning and happiness to take a pretty big hit. For example, I felt a little excitement when I found out my college has a free gym that lets people workout there without an id--which means I can get away there when I'm not committed to something (like that pharmacy tech job that, while I wouldn't go so far as to say I hate it, I dislike being there). Also, when some tv shows I like come up, I can somewhat enjoy them, though not as much as I used to. All my positive emotions tend to be muted. To be honest, if I did become a school social worker, making between double and triple what I make now, I would still have summers off to travel places. I've always liked experiencing new places and ideas. One of the reasons Military Social Work appealed to me was it combined helping people with travel with excellent pay...but I would never be accepted into that, so I'd best forget about it.
That sucks. I've struggled with depression before, and the toll it takes on your passion for activities is rough. For awhile, the only pastime I even enjoyed was sleeping. LOL. But hey, I'd say that feeling little excitement about a free gym is a normal response. Gyms are
boring. Now if you found out about a free bouncy house or petting zoo ...
Meh, well being a pharmacy tech also sounds extremely boring (not to knock on pharmacy peeps or anything).
I really think that you should focus more on what's going on inside of you than how your external circumstances are affecting you. Let go of what you can't do because of your medical conditions, and don't let them rule you, make choices for you, or dictate anything else about your life. It might not be a bad idea to get help as well if you're not already in therapy or taking any medications. Also, I'd recommend looking into nutrition for mental health. It's a controversial enough topic that it would be a foolish idea to let nutrition take the place of therapy or medication, but I've found it to be a nice supplement to hard-core treatment.
Also, healthyplace.com is one of my favorite sites for this kind of thing. I'd recommend you check it out and maybe surf some of the blogs and stuff. It was a big help to me when I was struggling.
Mental Health Support, Resources & Information | HealthyPlace
And if you can, make a support group and find people to talk to about this stuff.
If you have any questions about happiness and mental health, let me know, but I don't want to talk about money or jobs anymore.