This is one of the more useful bits of advice here in my opinion. Things like exercise, sleep, eating well etc. could go some way to coping better with the und

This is one of the more useful bits of advice here in my opinion. Things like exercise, sleep, eating well etc. could go some way to coping better with the underlying issue, but by themselves are unlikely to address what’s actually going on. The situation described suggests that feelings are not being managed very well. There could be lots of reasons why, but given the severity any quick fixes from random people on the internet are unlikely to result in sustained improvement.