Re: Is it possible to train Aikido by my self?
Consider a meditation practice, or Chi kung practice, or yoga, or Argentine tango. Anything that helps you "synchronize body and mind", or practice becoming more minutely aware of your posture, breathing, relationship of the various parts of your body to the other parts, etc - will help you develop skills that are applicable in Aikido. It's not a substitute, but can certainly help speed your progress in Aikido once you are able to get back to it. And will likely provide many similar side-effects to the things you mentioned in your original post. At least - this has been true for me.