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.
Definitely worth seeing a doctor, getting dizzy easily is a bad sign. (Not a "you're about to die" sign so relax, but also there's no reason to be dizzy on a regular basis and it's probably fixable.)
Random things to check because people listen to internet comments instead of seeing a doctor for some reason:
Do you do enough cardio? (ie: Are you just feeling faint because your muscles got bigger and now your tiny baby lungs can't support them?)
Do you get enough salt?
Does sitting on your floor and doing exercises also make you feel dizzy? (ie: Does your home have a layer of settled gas that's making you feel faint? Open a damn window.)