I also get crazy itchy legs 1-2 days after shaving, especially above the femurs, resulting in intense scratch-til-bleed itchiness especially at night, but even during the day. Interestingly, I also shave my thighs, but they don't get itchy.
I tried aftershave, thinking the oils and alcohol might help, but nope.
I tried nair, which helps diminish the itch some, but then I'm rubbing god knows what chemicals into my body.
I tried different lotions, body oils, etc., which didn't stop the frantic itch.
I have finally found something that has eliminated the itch though: not shaving. Women didn't shave before the early 1900's. We managed to be beautiful and sexy throughout most of history not shaving our legs. So why put ourselves through that torture now? I do not have any problems dating and make sure the guys know upfront. It's not a problem. Beauty is in the eye of the beholder and I am beautiful. You are beautiful too.
I had the exact same problem couple days after shaving. The ichiness comes from time to time. I used to take allergy pills to control it. My friend told me to try waxing and I did. It turned out pretty well. The hair grow out smoothly and don't ichy anymore.
I did that at the salon first couple times. Now I did that by myself. No more irritation and the red spots left from shaving are slowly disappearing. Highly recommend you to switch another hair removal method.
Try using a different shave cream
Replace your razor
try waxing instead
or use lotion
Those are the 3 best solutions I can come up with. Depending on how old your razor is, it might be irritating the skin. The shaving cream you are currently using might be iritationing the skin (allergic reaction)
Try waxing, because the hair stays gone for longer and there will probably be less irritation after you wax. I recomment using organic wax.
I have a suggestion for you that works for my itchy legs at night. I get them after showering and I have forced air heat so the winter is the worst time for me. If I remember I rub in Cocoa Butter and that puts a stop on itching. If I do that daily I am OK. You can buy Cocoa Butter at any pharmacy and it is very inexpensive too. Good Luck!