Here is what I have found - if my theta is TOO high it mean I have too many positions purely in premium collection strategies. 30% of those are bound to move against you.
I recommend you watch the videos at TastyTrade to learn about managing options. The recommended move is to move up the side that did NOT go against you. This should yield you a credit (assuming you sell these options). But - it also narrows your "break even" territory which lowers your POP. When these things happen, the best thing (after you roll up) is to watch it to see happens, and then take whatever profit you can get, or just close completely for a small loss and start over.