Does anyone still have depressive episodes despite being stabilzed?

Title

Ive been diagnosed for 3 years and medicine compliant for a year, but I still get depressive episodes that last a few weeks every couple of months

I have bipolar 1 and I know its more drawn out episodes but im taking my meds everyday (200mg lamictal) and i still get smacked upside the head with these episodes

Another question does anyone else get scared when they feel too happy? I find myself purposely making sure I dont get too happy because im afraid ill have a manic episode if I do