Constant internal vibration, muscle loss

I am having internal vibrations or tremors or buzzing like feeling on my whole inside body especially those two legs.I can feel it more like while sitting and lying.It is more like electric current flowing feeling inside.I dont know what is the exact cause as before i was diagnosed with PPIs like ranitidine,Rabiprazole and Omeprazole(The first two i took for only once each for total of 2 days and for only omeprazole i took 1 caps each for 4 days).They even prescribed me one anxiety based drug named gabapentin which i had not even taken once till now knowing its side-effects are worrisome.I dont know exactly what is happening me, as its exactly weeks now i am having acidity or acid reflux or whatever(as suggested by one medicine specialist).But that not only the issue but most horrifying issue is why my muscle mass is just gone, means i can even press or pull my muscles easily. Apart from it im feeling weak or numb, sometimes even breathing difficulties while reading or studying.