Pumpkin seed oil with regrow some hair. It is also useful for killing parasites. But parasites may not be the reason for your hair loss. There are many reasons.
Also, pumpkin seed oil is just one part of a parasite protocol. I would recommend that you get some FOOD GRADE diatomaceous earth and start taking that. It will replace trace minerals that your body may be lacking and it will also help with parasites. But again, it is only part of a parasite protocol. It does seem to work well on worms, so you might get an indication of whether you have worms or not. Worms are extremely common.
Google Dr. Andreas Kalcker and read his parasite protocol. It's free, it's 18 pages and it will give you a good basic education.
Don't do a lot of herbs until you have a good parasite protocol and knowledge of what you are dealing with. If you start the herbs now, the doctors may blame that for your hair loss.
Clean up your diet, eat organic only. Our foods are heavily contaminated with toxins. Avoid chlorinated water, bromine and fluoride. All will make a bad thyroid worse.