Sorry to hear that you have these weird sensations. You say that you tested positive for RA? If you have any swelling, the nerve could become pinched and therefore give you a tingling and a feeling of weakess.
On the other hand if it is anxiety, I'm with you, I would not want to go on any pills with such minor symptoms.
Why not give yourself some time-out to reduce the stress levels. Get into a habit of giving yourself good cleansing breaths and nature- a tree, the grass take a flower and be uplifted at the beauty and wonder of it all. When I feel myself being anxious the natural reaction is to retreat and pull back. This makes me tense up and the adrenalin starts pumping around my body giving me weird tingling sensations. To stop this from happening i need to float forward into the sensation (instead of pulling back) and to breathe and to feel a smile coming. This will makes the weird sensation disappear.
Why not ask to have some blood tests done. Other than the tingling and the weakness, do you have any swelling or hot tender joints, or tiredness?