I agree with everyone, at times its just exhausting and hard to see it getting any better, but Bipolar does cycle, it always does, it will eventually spit you out the other side.
I was diagnosed late also.
I will say that some lifestyle changes really made a huge difference.. more so I feel than the psych meds I use to take.
I cut carbs out of my life, Maybe a carb once or twice a month at most. Carbs bogs me down mentally and physically.
I make sure I get outside daily, unless its a monsoon. I take Vitamin D year round.
I shower every single day no matter what.. Yeah that's a tough one some days, but its my personal law !
I wrote down about 100 positive things on slips of paper and when I am feeling lousy I pull one out and that is my motto or chant for the day, Sounds silly maybe? But hey! whatever works I say. I did have to goggle to get the first useful amount of positive things

Once I was feeling better I was able to make up my own.
I hope your able to find a way to feel better soon