Feel like Mind nd body is disconnected.

Sometimes i feel my mind and body is disconnected here are some symptoms 1 while normal walk i get flips mean my legs bends lit bit and den immediately i control myself.. This happens very often with me 2. My reflex action is weak.. I always react late in short timing situation like applying break in bike when something comes in my path suddenly 3. Worse situation comes after 2 or 3 months when i feel like im flying, dizziness, fatigue, blurred vision an this lasts for 2 to 3 days and then automatically comes to normal.. It happens once 2,3 months 4. Weak memory, inactive, confused, double minded always 5 sometimes my heart starts pounding like something is happening in my chest.. And my breathing rate increase like some short and fast breathing.... Feel like i m going to fall on floor.u try to sit down for a while it Lasts fr one hour almost... It happens when i get feeling of fear.. vertigo wen i stand up suddenly. my sleep always disturbed type evn though i sleep fr 6-8hr