I echo what the others here have said about tapering. I have come off medication successfully once (when I tapered very slowly with my GP's guidance) and have failed dramatically once (when I tried to do it by myself and far too quickly - bad idea!). If you feel that the reduction has been too steep, there's no harm in going back to your GP and asking for the plan to be adjusted.
As far as your anxiety flaring up, there's every chance it's connected to the reduced dosage. I've experienced a similar thing recently going from 30mg to 10mg escitalopram. I think to some extent it is to be expected (after all, that's what the medication was there for). It might be worth keeping a diary of your thoughts and feelings as you continue to reduce your dose, so that you have some records to illustrate how things are going when you next speak to your GP. Aside from that - remember that things will be changing in your brain and take care of yourself accordingly! You might need more rest, more support and more patience from those around you as you go through this transition, and there is nothing wrong with that!
Good luck with your meds journey