Bookmooch

Anyone used / using Bookmooch? Good? Bad?

I especially like the way it hooks in with LibraryThing, where I am doggedly cataloguing all my books, even the bad ones.

Sudden-onset Food Allergies

Wednesday: had Standard Werk Lunch #3 of Ryvita & Whole Earth peanut butter. By 2:30 felt really ill (vomitting, dizziness, slight visual disturbance, overheating). Ended up going home.
Thursday: dozed in bed. Symptoms cleared.
Friday: had Standard Werk Lunch #3 of Ryvita and Whole Earth peanut butter. By 2:30 felt really ill (vomitting, dizziness, slight visual disturbance, overheating).

Is there a pattern here? Has anyone else experienced sudden intolerance of favourite foods?

I should add that I've been suffering from more-or-less constant low-level stomach upset since late November. This is different, or at least a different set of symptoms.

Neither Ryvita nor peanut butter (nor nuts in general) have ever bothered me before.