The advice you received is excellent. You have to do this in steps. First, it's lose the MS privileges; then it's fade altogether.
Before you tell them you want to stop being an MS you have to miss some assignments, be sorry, very sorry and turn down some privileges. Let some know how stressed or sick or whatever you choose as your problem of choice you are.
Once you ask to step aside you will be sat down and they will discuss why you need to step aside as an MS. Give the reasons you've read here - they work. Don't confess to anything. If they ask direct questions about your situation make sure you convince them that you still want to be an MS but you just can't right now - you will again in the future once your situation changes for the better.
They will most likely keep you on the MS list for several months with lightened or no duties. At that time they will want to reassess with you whether your situation has improved and you can continue on. This is the hardest part. You have to convince them that it's best for you to officially stop being an MS and that you hope to be reappointed sometime in the future.
Once both those parts are done you can slooooooowly ease up on non-MS responsibilities - like offering prayers, public reading (do they read at the new bookstudy?), etc.
Then ease up on meeting attendance - which you've probably already started 'cause that is the easiest thing to do in this whole mess.
With a zealous family they may call you out. Be prepared to stick to your stress, sickness or whatever guns you chose. Don't falter.
And remember, you have friends here who can sympathize, empathize and commiserate.
Successful fading can take a long time.