Okay, so I have tried to ignore this but it has become such a big problem that I really need help/advice.

I stopped eating meat except for fish in about December/January. I have also lost about 73 pounds. In the past 4-6 weeks I have noticed a large amount of hair loss. Am I getting enough protein? Or is there something else going on with me?

I'm sorry that you're going through this... I understand how frightening it is to deal with.
It's definitely something that you'll want to talk to your doctor about... it could be any number of things, diet one of them. It's probably nothing serious, but certainly get checked out just to be safe.
I'm sure this isn't the reason, but I go in spurts where I lose a lot of hair (luckily I have a lot) due to my lupus. Actually I just swept up a pile of it in front of my scale. It was very scary when it started happening, and still kinda is, but at least now I know why, and that helps.
Best of luck!

Hair loss can be caused by not eating enough fat... eating a low amount of fat for a long time can result in hair loss (among other issues). You need to see your doctor, and make sure you are getting a good ratio of fat/protein/carbs as well as all your vitamins and minerals. It could be any number of things, but you mentioned that you gave up meat so I wonder if you are getting enough fat from other sources.

My hair fell out when I went low low fat.

I had same thing happen~Consult your doctor most definetly
Mine turned out to be hereditary balding(LUCKY ME) Ilearned from a dermatologist after being placed through several test to confirm to make sure it wasn't something else..Anyways I started using Walmart brand Rogaine & Now 7 months later u can not tell it at all! I have regrown hair! So It may be a thyroid problem, a defiency in food ~or genes,Or a number of things definetly go to a doctor~We can only guess ~They can test ya & know what it is for sure.HUGS* & goodluck!

I am sorry this is happening for you and I concur with the rest of the replies, I would check with your doctor and have them evaluate the situation. Keep up the good work and keep posting

Are you taking any type of multivitamin? The hair growth cycle is not immediate so hair falling out/notiiceable balding could be a result of something a couple months ago and may take a couple months to notice positive change.

I'd look at taking a multivitamin if you aren't already, look at how much fat you are eating, etc. I eat a low fat vegan diet but some days I realize that I'm just not eating enough fat so I add something here or there with fat like olives/avocado/etc. I've never had hair fall out though.

Lack of vitamin B12, which is found in animal products, can also sometimes cause hair loss. Strict vegans and vegetarians need to look out for this, but since you're eating fish (and maybe dairy and eggs - you didn't specify) perhaps this isn't the culprit. It's worth getting checked out though.

I don't have an easy answer because I am going through the same thing. My loss is quite excessive and its really noticeable now. I am waiting to see a new doctor on the 27th. If you google weight loss hair loss you will come up with some information. I guess it is common for some people to lose hair while dieting. I understand how unsettling it is. I am at the point where I don't have much more to spare.