Definitely 100% is a nerve issue.
The only thing that causes tingling and numbness is nerves!!!!!
What your describing can be caused by nerve impingement or simply due to nerve tension. It would be useful for you to go to your doctor or a physiotherapist to determine what nerve is being affected and exactly where the problem is originating from.
You can do some nerve glides for a week or so and see if it helps but you shouldnt be lifting any weights or doing anythign strenuous as this is going to irritate and put more tension on the nerve.
To do Nerve Glides
The easiest way to do a glide is this
start with your arm straight at your side with palm facing forward
Actively bend wrist backwards and hold that position
Keeping wrist backwards slowly raise arm out to side until you feel the tingling/ shooting pain of numbness in your arm.
Once you feel that you need to bring your arm down just a bit so its not in that region ( there should be no pain ) and then slowly pump your arm up and down just below that range where you get symptoms.
This is a very basic nerve glide if you dont understand or cant elicit symptoms PM me and ill give you some more specific glides to do instead.
I always try to describe to my patients how exactly nerves work and heres the best way i think
Pretend there are like garden hoses in your arm where the nerve runs.
And pretend that the nerve is like a piece of floss.
The floss should move freely and bend with the movement of the garden hose.
Sometimes when stuff builds up insde the garden hose or the garden hose is pinched the piece of floss ( nerve ) cant move freely as it is intended.
By doing this nerve exercise you are somewhat flossing or freeing up the nerve which should amount to less pain and discomfort especially the tingling and numbness caused by the nerve tension.
Hope this helps
if you need more help please PM me
it is somewhat hard to describe things on here sometime
)