I also am having heat sensations in hands, top of head, and right leg now...ugh.
Hi there. Pins and needles in the upper limbs could be due bulging disc in the neck. you need to get an MRI lumbar spine to consider the paresthesiae in the lower limbs. Muscle cramps can be due to simple causes like muscle fatigue, heavy exercise, dehydration, hypothyroidism, hypomagnesemia and hypocalcemia, side effectsof drugs like diuretics, caffeine. muscle cramps are cause by more serious neurological causes like motor neuron disease, muscle diseases, denerevation usually accompanied by weakness and atrophy of the affected muscle group etc. You need to see a neurologist to examine you in detail and check these symptoms. Hope this helps, take care.
I forgot to add i'm a 22 year old male.