On deadlifts I nearly faint when I go down. I get that this happens a lot when you lift heavy, but I’m not lifting heavy. Not even relatively. It’s 65 pounds which is nothing to me. When I first started I didn’t get lightheaded, but now even with 65 for a warmup I’m dizzy. By the time I go to my main workout, I go to 75 or 80 and at this point I’m about to black out after like 2 reps. Again, not heavy but something is still wrong. I think my form is correct. Deep breath with belly expanding on inhale, brace, and squeeze glutes.
I also want to progress with chin ups, but I can do neither pull ups, chin ups, and even lat pull downs aren’t doing anything - the pull downs I feel in my upper back, and then my forearms get super sore even after leading with elbows. I’m doing a chin up grip on pull downs with ‘hooks’ (thumbs on the same side as other fingers). I tried negatives briefly, but the pull up bars are at an angle, and there were too many people at the squat rack which is the only place with straight horizontal bars.
Do you have a fitness tracker? It would be useful to know what your heart rate is like when this happens.
As for the pulling exercises, if you can afford it, resistance bands are good. You can do assisted pull-ups this way as you build strength. You can change to different color bands depending on how much assistance you need.