How often do you take time to charge your spiritual energies? I have found that when my mundane life overwhelms me and I do not take the time I need to attune myself to the REAL world that I stop being able to function on a spritual level. I neglect that part of me and it starves without the energy I should be absorbing from the world. If you aren't meditating (in whatever form that takes for you- I like weeding and pruning and harvesting plants as my form of meditation) then I wouldn't be surprized if you can't do the things you used to. I don't know about anyone else, but I get cranky and depressed if I don't take time to see to the balance of my life. During a particularyly stressful time I even began suffering frequent dizzy spell which continued to worsen to the point of almost fainting until one day I was struck with this dizziness while outside. I leaned against a tree for support so I would not fall and felt as if warm arms wrapped around me to steady me. I was filled with the relief like you get when you finally get get a drink after being thirsty. I stayed there as long as I was able, just feeling the love of that tree, and the next day I was no longer dizzy at all! I felt good, I slept better, and I was able to resume talking to my non-human friends as I had so often enjoyed before I let myself get too busy for them.
So my advice, for what it is worth, is to find what fills you with light and energy and take the time to nourish yourself as often as you can. Loosing abilities in my opinion is often a symptom of a deeper problem, not the problem its self. Find a place where you can feel at peace and love everything around you. When you are spiritually healthy again, what you lost will be able to return.
And I would be happy to tell you what I know about preserving things. The key is rock salt, and lots of it! The wings I preserved were twist-tied to chopsticks to hold them open in the position I wanted, then laid in a (clean!) pizza delivery box which I had packing taped the vent holes shut. I laid the wings inside and poured in a box of rock salt. I then taped the box shut and left it in the spare room for at least 3 weeks. I have yet to wrap the handle part in leather, but that will finish the fans.
The feet I pose around semi-precious stones and hold in place with rubber bands. (this takes manual dexterity and practice, don't get discouraged!) They can be air dried if it you have a warm, dry place, or put in salt. I also shove a piece of wire up under the skin as far as I can and leave about 6" haning out the end. The skin will shrink around it to keep it in place and it can later be bent into a loop to hang, or you can drill a hole into a stick to hold it as a wand. In either event the wire is neither pretty nor secure, but when you wrap it it looks pretty good and the wire helps a lot while you work with it.