This sounds a lot like other remission stories I've read either spontaneous or they used something that worked. They get better for weeks and months, some for years but then typically there is some increased stress and or trauma or another infection and they relapse. We are under tremendous pressure to earn a living, get an education, a job, a family etc and also keeping up with the jones'. When it seems like the nasty condition has gone away, its very tempting to take it all on again and to keep pushing when symptoms come back. But, in most cases that seems to lead to falling back to a worse condition. Often, using what made the first recovery happen, no longer works
I think keeping on with pacing and not pushing yourself physically or mentally is very important to keep the remission going. The pressure to work and have a normal life is very strong and that is why lots of pw/cfs often relapse. OP may be able to get back to remission by stopping the stressful activity and doing careful pacing. At a minimum that will help avoid getting worse. Every case I heard about where they kept pushing, they always got worse.