Milk supply dropping; how can I pick it back up?

I lost my fiancé on the 12th, and I didn’t eat for 6 days, just couldn’t. I also didn’t drink but maybe two bottles of body armor drinks each of those days.

I’ve hardly ate much since then. I went from 158 to 144lbs. I’m really upset because I started taking legendairy pump princess supplements a week before he passed and it seemed like I was finally starting to catch up to my 3 month old. But now I’m back where I started. AND I’m pretty sure I’m getting mastitis in my left breast.

I’ve been really depressed because it seems when everything is going good, something horrible happens. I’ve been tempted to give up on breastfeeding. But I want to give him as much breastmilk as I’m able to.

Is it even possible to increase my supply at this point? I pump about 2 after 3 hours, and he can get about an ounce. He’s almost 4 months old. ((He ALSO has lip tie issues. He has already got one revision, going for a second opinion on March 4 since the dr that did it the first time did it the old fashioned way and didn’t tell me to do any exercises.)) I’ve been supplementing with a lot of formula.

I’ve also already seen two lactation specialist. They say I’m doing a good job but his latch is still a problem.

Idk what to do.