Is it normal for weight to fluctuate so easily due to lack of appetite? i easily shed 5-10lbs in few days due to anxiety. when relaxed i regain.

Fluid changes : Changes this rapidly are more likely due to fluid changes than true weight changes. There may be other explanations but this is the one that would explain the rapid changes.

Dr Fowler and another doctor agreed

Therapy?: Anxiety can greatly influence weight gain or loss. Have you yet tried any form of psychotherapy? Typically, the optimal combination of things to treat emotional issues such as anxiety or depression is medication (which, on your best day, is supposed to take the edge off symptoms) but the real gruntwork takes place in psychotherapist's consulting room.

Dr Ochoa agreed

This is extreme, so: I presume your anxiety is, too. Check with your MD for a physical eval, and then go directly to a psychiatrist or clinical psychologist for an anxiety/depression workup. You have classic sxs, which in your case are too strong. Up and down weight gain/loss of this magnitude and in this short time frame is hard on the old bod... http://www.psychologyproductsandservices.com/page2.html