Whether or not you can convert to Ch 7 will depend entirely on your non-exempt equity, income, and also on your B22C (means test). Your attorney can thoroughly review your case and advise you whether or not this is an option.

One thing I would suggest that you ask your attorney about... check to see if any of your unsecured creditors failed to file their proof of claim by the deadline. If some of them did not, then you can actually try to modify your plan and lower the payments based on the lesser amount of unsecured debt to be paid through the plan. Also, ask your attorney to explain why you had to repay at 100%, and perhaps you could still file a motion to amend the plan to pay a lesser percentage based on your change in circumstances and increased expenses.