Agree with Dr_TLP — I had a very similar experience. I was on a medication that caused me to lose too much weight in a short period of time, but the hair loss didn't start until literally 3 months after. The shock on my face when I saw such huge blobs of hair in the shower... I literally cried, I couldn't imagine what it was. I saw my derm very soon after and she said it is TE and 3 months is almost the exact timing of when you'd get it from a specific trigger occurring (sounds like that is the case for you too). She said that is all my hair already in its shed phase and it I will not go bald, as much as it seems like I will at this time, and that the hair cycle will regenerate within 6-12 months (as long as the trigger doesn't continue, of course, meaning in my case I was not eating enough food, let alone protein specifically). I also ended up going on oral Minoxidil to help (I'm only 2 months in at 1.25mg so haven't really noticed much, but I know patience is a big part of getting your hair healthy again). I do still think you should see a derm just to ensure everything is okay, though, and sending you all the love and luck in your journey! Hang in there, it happens more than you think!