Having just walked my mother through severe reactions & symptoms to withdrawing from SEVERAL antidepressants (Lexapro included), your symptoms sound more like withdrawal from the Lexapro than a reaction between Gingko & Trazodone (but I'm not saying that you're NOT have a reaction from using those two together; I've never researched a Gingko/Trazodone combination)
Here's a Google search for Lexapro withdrawal symptoms (posted by HUNDREDS of people!). If you take a couple of hours and read through them all, I'm sure you'll get some reassurance and some insight as to what's actually causing your current condition.