You could take a depression test online. To qualify as depressed you need to fulfill a certain number of 'depressed' criteria. So if you are depressed, then antidepressants might be just the ticket.
I have been on them once (not Alz related), and the difference was quite astonishing. I slept well and woke refreshed. My doc explained that depressed thinking shuts down neural pathways, and our options seem less and less ,as our thinking gets narrower and narrower. After a few weeks I felt his description was correct, I was much more open to things. I remember noise used to drive me crazy. Zero tolerance for TV, radio, music and it is that I regret in my kids' youth.... I simply could not watch TV, it was worse than running a back to back marathon, so incredibly tiring.
Many years later, and I stayed on those pills for about a year and a half, I am still depression-free. Dementia is challenging, but it is encouraging for me to be aware that I am NOT depressed.
Remember most anti-depressants take about 6 weeks before you really feel the lift. And if you don't feel any better after 6 weeks, tell your doctor and ask for another kind (active ingredient), as not all work on all of us.
Before you go to doc, I would make a list of your symptoms. It makes me feel so much more coherent to be able to describe my ailment as is, and not have to scrabble for examples of depressed behaviour when caught on the hop.
Keep us informed of how this works out for you. Feeling good and happy is really worth striving for, and I spend a lot of my time meditating now.
Yoga nidra is 'sleep' yoga, a deeply relaxing yoga, where you systematically relax each muscle in turn which helps stop all the nervous energy and reptilian-brained anxiety circuits from being loud and dominant. I could PM you instructions if you like. This is my life saver and I personally think I have never been so stable and emotionally well since starting last March.
I really hope you feel better soon and you are brave and very responsible for posting this. Well done. Here is to mental stability and happiness, BE