Can hair loss be permanent after bleaching? Scalp is still numb 7 weeks later. Help!

It is not normal to have numbness after bleaching your hair.  Kenalog shots are not typical for treating chemical burns.

Bleaching the hair can cause chemical burns that may result in the loss of hair but the hair loss should not be permanent and usually will grow back. However, it may take a while for the hair to grow back. PRP would be a good option in the mean time to stimulate hair growth. 

Hair loss and thinning may be improved by a series of monthly PRP injections combined with Progesterone. I'd suggest seeing a professional in the field of hair loss to discuss the best treatment options for you. 

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I have had similar cases with bleach
and hair loss.   Sounds like you had a
mild chemical burn since you reported itching, burning, numbness and hair
loss.  There was no oozing, bleeding,
open wound or infection.     
Hopefully hair will regrow, time
will tell.  Steroids could reduce the
inflammation and help with recovery. Next time, get your hair colored NOT
bleached.  There is a difference.

I suffered the same fate and it takes a good 12 months to see what will grow back. I recommend seeing a hair restoration surgeon to have photos taken, so that you can be tracked and see what grows back and just how much. There are a few other options available to you, which can be recommended at a consultation.