I've never seen an angel but I've felt a loving/comforting prescence occasionally, and had a couple of weird experiences while having Reiki healing. (My mum is qualified and does treatments for me occasionally)
The first was a strong smell of burning or smoke. I assumed it was incense or something and didn't mention it until after the session, when I described it and she said how strange, because one of her guides is an American Indian and always smells strongly of smoke, and had been there that day although he wasn't usually.
The second was a loud bang or crack noise in the corner of the room which made me jump, again I didn't think anything of it, but mentioned it afterwards (sort of, what was that loud bang?) and Mum said she hadn't heard it at all but that it sounded like a spirit type noise.
The third was weird - I had been feeling quite emotional that day anyway, but had calmed down by this point. She had her hands over my face and it was making me feel a bit sick, but not too bad - I didn't feel like I was going to be sick if that makes sense. Anyway suddenly I just started crying huge great sobs, I don't know where it came from, and I don't cry very easily, so it was weird