Who cares how far down your strength has gone? Just get in the gym, select a MUCH lighter weight, and hit those reps. Less sets than usual. Slowly increase weight and number of sets as you can handle it. Since you are just starting out again, hit the stuff that matters, like squats.
Also, about the pics, hey, GREAT before pics. Keep them for a comparison as warmer weather gets here.
The number one recommendation I could make is this - A.M. fasted cardio if possible. It not only starts burning through the fat, but it starts your day off right and will very much help with the mental fog and depressed feeling. It resets your mood. I hate setting the alarm and heading off in the dark to hit fasted cardio, and, let's face it, I hate cardio. BUT. By the time I am finished and arrive back at my house I FEEL GOOD. Mentally, I am charged up and ready to take on the day. Physically I feel good, too. I do not know how to explain it, but I definitely feel better after a.m. cardio, and you can't argue with the fat burning.
Start tracking calories and macros on MyFitnessPal. Just the act of having to enter your food and drink into that tracking app will make you avoid certain things "Do I really want to put 5 tablespoons of Jiffy Creamy Peanutbutter and 3 cups of Breyer's Mint Chocolate Chip ice cream into MyFitnessPal and see in front of my eyes what I am doing to my daily macros???"
The answer will frequently be "No," in which case your eating will clean up itself. You will also be sure you are getting enough meat and eggs by making sure that protein number hits its target every day. If it doesn't, then you will need to make adjustments.
Fats? LOL! Tracking is just about the only way to hit your macro goals on fats, since they are so ever present in the American diet.
Track! It will get you on course right away.
Good luck!