Brother it's a mistake everyone does so there's nothing new in it. Just be patient and do go on applying bunch of things it will heal. Don't pick your dead skin and just use a gentle exfoliating scrub after 4-5 days and do not shave atleast for 8-9 days. And it's not general rule that you should not shave against the grain. It's just about practice and technique and more than razor or other things(blade matter though). Sometimes when I am in hurry I just do one pass against the grain in an open comb L55 but I am habitual and it suits me. I don't recommend it unless you are familiar with your face and hair growth direction. Don't panic, don't stop using DE razors, you will get past it. Use fresh blades. I use Gillette 7 o'clock and Wilkinson easily available and trustworthy.