Relentless Itchiness All Over My Body - Need Help!

I'm not sure if these are eczema symptoms or not, but I cant see the itchy patches anymore, they're not red or risen. I'm just horribly and relentlessly itchy all over and I have no clue what it is. it feels like dry skin, but kind of deeper, just like eczema i guess. It doesn't seem like an allergic reaction either, I don't think I'm allergic to anything and I never use scented soaps or anything irritating. there's not a single lotion or itch cream that I can find helps. sometimes it works once and then never again, like the itch adapts to it. it's not really constant but it flares up after I shower and it makes it so I never feel clean. I keep my showers short and always use lotion afterwards. I've tried many brands. I think it also flares up with stress sometimes. It's just all over my body, particularly in places where I've had bad eczema patches in the past. this has been going on for a few months now...there's a fee faint patches but it's mostly invisible. Seems to be getting worse.