First,
STOP WEARING GLASSES AS MUCH AS POSSIBLE RIGHT NOW!.
If you're at -5.5 (you don't mention any astigmatic component and that must be added too), then the specs you're wearing will be driving your eyesight even worse every second you wear them.
Go to
www.seeing.org and try some Bates stuff - also find a sensible optician who'll prescribe glasses about a dioptre less strong than you're currently wearing, (standard optical prescriptions are for 6/5 in each eye which is stronger than people with "normal" vision).
Cheers
Magoo
(check some of my previous posts for other tips - I was in your situation this time last year but had got a class one medical by May 2000 with -3 dioptres in each eye!!
[This message has been edited by Mr Magoo (edited 06 January 2001).]