Welcome to Healing Well.
How long have you been taking lexapro? It is common to experience side effects in the beginning of starting an antidepressant but these side effects usually wear off after a few weeks. Increased anxiety is a common side effects of antidepressants.
If this continues I think you should consult your doctor about this problem. I know increased anxiety is common in the strating of an antidepressant but I am not sure about paranoia.
Talk to your doctor. Take care and keep us informed of how you get on.
I am sorry for the loss of your grandmother.
Feel free to post anytime.
Co ~ Moderator for the Depression Forum
XX Life is worth living XX