I am assuming the diagnosis is correct.
In my opinion Voltarol rub and methocarbamol are not appropriate.
You need Nsaids by mouth and I note that you cannot take Ibuprofen, but that is not the only nsaid as Naproxen is valued alternative in musculoskeletal disorders.
If this is trochanteric bursitis, then you are looking at at least 2-3 weeks od pain and discomfort.
I would comntact your GP with your concerns and mention Naproxen. Although Pararcetamol is not an Nsaid in combination with Naproxen may be useful.
No, I haven't had experience of bursitis.