I'm really sorry this is happening to you as well. I don't know if it's the avg. Maybe? I know it is the second ingredient in the condish I've been using as a cowash so maybe there's a pattern.
I'm not sure that my hair likes avg... gels with it give me that flash drying effect and I used to use Kiss My Face Whenever shampoo and condish a while back and I didn't really like them. (Aloe is the first ingredient.) But I think it's a hair thing rather than a scalp thing. I thought the KMF shampoo + condish was too drying. Oh and when I was using those I didn't experience hair loss, so I guess at least for me it can't be the aloe by itself that is causing this.