Hello, Welcome to health care magic. I am Dr Alok Sinha, MD Psychiatry from India. I can understand your concern. I will try my best to answer your query. I have carefully read your question and could understand that you are having mainly sleepless nights. It appears that insomnia is your main problem. Due to inadequate sleep at night your body and mind does not get refreshed. As a result you feel weakness, dizziness and light headed. Dizziness immediately after standing up is common after prolonged sitting or laying, but it occurs more in a sleep deprived person. It appears that you are taking sleeping pills for some time, but now a days not able to get sleep even with sleeping pills. Sleep disturbance may be due to depression/anxiety/stress, but with limited information I can t say what is the cause in your case. I suggest you to consult a nearby psychiatrist who may assess you in detail and prescribe you few medicines for cure of underlying illness as well as insomnia. Hope it answers your query. I wish you a better health.