Unaffordable monthly payments on ICR

I have about 60 more payments to go and am currently on the ICR plan. My monthly payments are $400 and scheduled to go up to almost 600 on PSLF eligible plan once I recertify. We have had unexpected expenses occur and the monthly payment is just no longer doable with everything else. Has anyone been in this situation and what have you done? Should I just put myself in forbearance? And other than getting interest accrued on the loan, will I be affected negatively in another way?