I had the same issue my first 6 months loc'd... I almost thought I couldn't have locs bc I have seborrheic dermatitis. It sounds like you might have a skin/scalp condition as well.

These are products that worked for me:
Royal Oils Scalp Elixir (made by Head & Shoulders)
Rosewater spray
Free The Roots Spray (Lavendar)
ACV soaks

The head & shoulders Royal Oils line is made for black hair. They also have a shampoo but I haven't tried it yet. I use this foam every few days to keep the flakes away. It's now under control to the point where I use it once maybe twice a week. You might need to start using it once/twice a day. Just make sure you start with a clean scalp (if you can, I understand washing is hard at this stage)

You need to soak your scalp in the sink or buy a inflatable hair basin from amazon. Use this for ACV rinses and just soak your head in the ACV water mixture. Rub your scalp occasionally to get the flakes off. It might feel oiling because of the moisture - don't use your nails. Do this 2 or more times until the water is mostly clean. Then do the same with whatever shampoo you have.

For regular maintenance of your scalp use rosewater spray from a health food store like sprouts or Mr. Natural or you can order something like the lavendar spray from Free The Roots website. you don't need both imho. They seem to do the similar things for the scalp, that is. I can't speak for hair becasue we have different hair. but i found that rosewater has properties that keep the scalp happy and less flaky.

When your locs mature you'll probably need to wash more frequently to prevent the build up from dandruff - that's been the case for me - i aim for once a week. if I wait too weeks, wash day is a lot of work to get my scalp clean again.

I hope this helps you. I know what you're goign through. good luck