I use to be on 30 mg of lexapro, (escitalopram) went down to 10 mg, but going back up again to 20 mg is harsher even when I slowly increase it by half dosages. What gives and what can I do to make it easier?

Depends. That depends on what the side effects are. If you have GI upset- consider taking probiotics or take it with food. If you have insomnia - then take it in am. If you are experiencing medication related anxiety - then consider adding in deep breathing exercized. Please let your doctor know. Blood levels may be higher the second time around.