Our expert says:
Sounds as though you might have some sort of weakness or instability in the ankle, and that you might do well from improving the strength of the ankles. If there is any weakness, it will get exposed right away when you start training, which seems to have been the case for you.
I think you need to look at how you might improve the strength of that ankle. The Powerplate is a good way to do it - also consider simple balance exercises. If you balance on one leg at a time, eyes closed, you're teaching your ankle how to be more stable, and that's more important, often, than strength.
As for the weight gain, I wouldn't panic just yet. 2kg can happen quite co-incidentally. You drink a glass or two of water, you eat a meal, and the next thing you have 1kg of weight added. Then our mass does vary by 1 to 2kg from day to day, so you can't take one measurement too seriously. Rather track it over weeks and see how it's changing.
Of course, given the change in activity, one expects the slight increase. If you're feeling heavier and sluggish, it might not simply be a function of increasing mass. You might, for example, have increased your plasma volume - that happens as a result of training, and I seem to recall a study that found that swimming caused a larger increase than other activities. So there is a chance that some of the weight gain is because you've literally made more blood, thanks to swimming.
Ultimately, this is all secondary, and you need to sort out the ankle problem. I think balance, Powerplate, and then perhaps consider seeing a physio, only once, to get some more exercises that they can demonstrate for you, and see if that will help.
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