Hi, thanks for writing to HCM.
A large knot at the base of deltoid muscle
has nothing to do with the tingling & weakness in fingers. This needs a detailed clinical examination and xrays of the involved area to diagnose the condition.
Regarding the weakness & tingling sensation
in ALL the fingers, It cannot be due to CTS, as the thumb, pointing & middle finger are more often involved.
I suspect that your symptoms are due to compression of the nerves in the cervical spine
possibly due to a protruded intervertebral disc
. An MRI scan is mandatory to diagnose this problem. As you have WEAKNESS also along with tingling & numbness, I personally think that there is no role for conservative management with medicines alone.
Consult an orthopedic / spine surgeon
for further evaluation and management.
Hope this information is helpful. Good day