Frequent urination. Is very very yellow.

Hello,I have been suffering from seviour dehydration for last 6 years.my blood sodium level is normal but that sodium is not absorbing in my cells.thats why my whole body is so dry.due to chronic dehydration now I am getting little convulsions sometime,not so seriously but I get.for that reason I have been suffering from frequent urination for last 1year.If I drink electral powder water goes out of the body in half an hour through urination.I am taking some homeopathic medicine.but it is not working properly.when it work and I go to urinate after 4,5 hours urine colour is very very yellow.but when medicine stop working urine happens as usual in every2 hours.and urine color is also then normal,watery,my skin is so dry due to less water, scalp is full of danruff,in ear full of dandruff,eyelids are full of dandruff whole body is dry,I am 26 but looks like 35, body is unable to hold water.No blood sugar,no thyroid,I took steroid 6 yrs back at that time doctor told me to eat sodium more,plz