Inquiry about the effects of botox for the trapezius muscle

It's not that my levator scapulae muscles are particularly developed and it doesn't look good.

I don't know if it's just my posture that's the problem, but my shoulders are so often tense.

My levator scapulae area is very sore and painful often.

There may be some cervical disc problems, too.

If I get physical therapy, it only lasts for a short time and then I get stiff and sore again.

Even while working, my levator scapulae hurt so much that I had to massage them with my hands often.

When it's really bad, it's hard to even sit down, so you have to lie down for a while.

Is it possible to get botox for the trapezius muscle for therapeutic purposes rather than cosmetic purposes?

The pain is so bad, I'd like to get a shot if it makes it less painful.