Yeah, I sort of agree. You may consider singlehood again. Step is, you need to improve your life first. Since I shared the same 2 conditions like you, I'II share some coping method. However, since you are lady & I'm a dude. Our symptons & coping methods may diff. So, take it with a pinch of salt.

Do you know that it takes 2 unsuccessful screwups to make 1 failed relationship? (Sorry, if I sound harsh).

1st: take a step back & look at the relationship from a 3rd party view. Is your relationship becoming toxic for both of you?

1a) If you choose to continue this relationship, then you may considering things like moving out on your own. (least for couple of months) Fix your mood & your lifestyle.

1b) However if you opt out, you STILL need to fix your mood & lifestyle. If you are an active person. Go take up an outdoor sport, exposure to sunlight fixes our mood. If you are an inactive person, go take a morning walk every weekends.

2nd: Working at home. Consider bringing your work to the public library or a quiet corner of a cafe. It will help to uplift your mood. Plug in your earphones if you can't concentrate.

3rd: if your condition is very serious or it's biological (meaning you inherited it)
take meds but don't forget your exercise as well.

4th: Talk to a family member or close friend who is willing to lend a listening ear. If you do have congrats to you. Unfortunately I have none. Well, **** happens.

That's all I can offer, be well.