numbness and tingling, painless electricity sensation in hands, feet, back, neck?

[em_01]

I will try to be as detailed as possible, please if you have any idea about this or any similar experience, try to help as I am very anxious about this.
3-4 weeks ago, after a night of studying, I felt this weird tingling/electricity sensation in my left arm, and I felt my left hand and fingers go numb. I ignored this and went to sleep and that week I tried to rest my wrist and arm as I thought it might help. Some days later I felt the same kind of sensation in my right hand, which then went slightly numb, then in both my feet. Next day I felt this dizziness and breathlessness at night, I went to the ER and they did blood tests (I wasn't fasting), my TSH was slightly high, like very slight. The rest was normal. I did a blood test again fasting for TSH, T3, and antibodies and it was all normal. I was still experiencing breathlessness, fatigue and lethargy, loss of appetite, increased heart rate so my doctor recommended me an x-ray of the lungs and it turns out I have an infection and got antibiotics prescribed.
The numbness and tingling still hasn't stopped. I started experiencing that electricity sensation in my back also 1-2 weeks ago. It only lasts a few seconds and it is not painful. I was also having neck and back pain which really intensified when I started school again.2 or 3 times I felt this burning in my neck. Also I have woken up 2 or 3 nights due to intense pain in my right leg. And now I also feel that pain in my left arm. I am also feeling some slight tingling/electricity in my neck going up my head.
Just to be clear, the numbness and tingling doesn't really last long.
Plus, I am still experiencing some chest pain and I did an echocardiogram, which was normal.
Please help I am feeling very anxious and scared about this. Could it just be anxiety or what? I am going to go to a doctor tomorrow but still I thought I would seek some advice and reassurance here. Is this a serious problem? I am a female who's only 17 years old I really don't know why is this happening to me. I'm feeling very scared every single day.