I never get writers block. I might come up with crap, but it keeps coming until I can sort it out and flush the flushworthy. I usually end up with a few good nuggets that make me happy even if others see a smear on the page where I see sparkle. Don't we write for ourselves, after all?
However, I do get writers "bog" - bogged down with too many ideas and not enough time to develope them. Slips of paper, pieces of envelopes, voice recording, mnummonic devices until safe to write a note--all methodology of the bogger. Just go with it; you can always cut it later and store it in a safe place--a digital or physical scrap chest to be unearthed another time.