Good morning, Kim.
Sorry to hear that Miles Davis is having some "different" issues from what he normally does:( It sounds as if he may be having/reacting in an allergic way if he's been itchier than normal especially on his face, legs and feet. While dogs can experience itchy eyes like we do, they don't usually rub their faces enough to cause actually scratches. However, having said that, I suppose his dewclaw might cause some damage if he rubbed hard enough. it's also possible that he's developed conjunctivitis which may require topical treatment to resolve.
Normally, I suggest otc Benadryl (diphenhydramine) at a dose of 1 mg per pound of body weight twice a day but since he has a vet appointment anyway, they may decide to prescribe something different than this. It certainly can't hurt if you wanted to see if it might provide some relief prior to his appointment although sedation can be seen which I think you know.