This is from the LH Facebook Group. It was posted by someone whose BIL is a retired GP. It's really nice. And grounding.
Recovery is a peculiar thing. And so here is today's little golden nugget of hard-won wisdom. Recovery is not a smooth, progressive taper, with the crappy symptoms getting less and less in all respects as time goes by.
What usually happens is that your exercise tolerance will gradually increase, but this is not necessarily going to be noticeable on a day-to-day basis, or even on a week-to-week basis. It's much more evident when you look back over a fortnight or a month at a time. Don't look for day-to-day changes, but keep a little note of (for instance) how far you can walk, or how much you can do, before having to stop to get your breath back, and you'll find that a month later this will have improved a bit.
The other thing that causes a lot of frustration and disappointment is that even though you may be able to do a little more than you could a few weeks ago, for a while you will continue to find that at the point at which you hit your 'wall' it will feel just as bad as it did at the start. This leads a lot of people into thinking that "it's not getting any better", or that something is wrong about the way in which your system is handling the situation. On the contrary, this is exactly how recovery progresses.
For a while, the 'brick wall' will feel just as bad each time when you hit it, but what happens over the weeks is that your limit will gradually move further outward - your capacity will increase - such that you will find you can do more before you hit the wall. Then what gradually happens, as more weeks and months go by, is that the 'brick wall' feelings will gradually become less unpleasant, little by little, and your recovery time afterwards will also get progressively quicker.
The frustrating thing is that your exercise tolerance will improve before the 'brick wall' thing does. This is normal. Keep this in mind and you won't fall into the trap of beating yourself up when things don't feel like a nice, steady, upward-sloping graph of improvement.
"I've never seen any of this kind of thing articulated or explained in any medical texts, or heard it described by medical teachers, maybe because it isn't a particularly sexy subject, and doctors tend to have a somewhat short horizon of interest in illnesses. Once a diagnosis has been made (or not), and any pronouncements offered, people are mostly just left to get on with it. But I've seen this kind of thing hundreds of times, and there is a remarkable consistency in the way people seem to go through this process. And I know of no way to speed it up. It is a natural process, and you just have to go through it. But have faith in the fact that your body is a fantastically subtle and powerful self-healing mechanism, and it will provide an answer, in time.