If you can't figure it out, it's not so bad to just start over. I had what I thought were high level characters as well, and after about a month and a half those characters would be near useless except for having a ton of strength for a mule

The only way I know of to reclaim that info would be to contact Turbine customer support or just go to their support page and take some guesses.
As far as the expansions, if you do the two week trial then end up subscribing it you'll have all the expansions.
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Zcifer, 70 Priest; Antagonizer 70 Warlock alt- Korgath (WOW) - Retired
Shojitsu (LC) (SC) - Zcipher Warmonger (VT AC) - Retired
Antagonizer (Middenheim WAR) - Retired