30, Male, 5'9" 160 lbs.

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My trainer is also a Physical Therapist and I have a consult tomorrow. Im not in pain, but in the last 1.5 years I keep getting an injury where:
-My neck hurts / is stiff, and my left arm hurts a lot
-First time in happened had a single finger be a little numb.
I have had it 3 times, ironically I believe it happened AT a PT when i was going for migraines. I am not really in shape, im 5'9 and 160lbs, but I want to strengthen my body to prevent this. It has happened after lifting something heavy once, and the other 2 times were hard to pinpoint.
I dont want to have to go get an MRI before going to start training, is this necessary? I dont want to over-test but I also dont want to mess up my back, its feeling good for a few months.