Suggest Remedy For Hair Fall After Taking Botox Injection On Forehead

I had botox injections in my forehead in July for the first time. I had a bad reaction over one eye where the eyelid drooped badly. That lasted about a month. By Sept I noticed the hair on top of my head getting very thin. I went to a dermatologist who said it was TE and not to worry it will stop shedding and will grow back. It has not stopped falling out and it much worse. All blood work is normal. I have been taking Biotin, Vitamin D and B supplements since Oct. I started Rogaine a month ago. What else can I do?