Yes, you can get out of it, by either allowing it to fail by missing three payments or asking your IP to terminate the agreement.
You will have lost that last few months payments and will be back to square one with your creditors, who will also add back the interest and charges, so your level of debt might well increase.
What is it that is causing so much stress ? Who are you with ?
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014