First of all, and know it's easier said than done, but you're not a burden.
As I'm sure you know, with meds like Lexapro, we often have to feel a little worse before we start feeling better. For most, the initial side effects are short lived (thank goodness). I know it's tough waiting to feel better, but it's something that just takes time. It could take 4-6 weeks, or it may take even longer (especially if you end up needing to try higher dosages).