A - Thanks for the question. There is no Church law which says you must receive Communion from an extraordinary Minister of Holy Communion. So, you are free to receive only from priest if you so choose.
That being said, I would offer a bit of advice for you.
- Make sure your focus is on the one who is truly doing the ministering and the one who is offering the sacrifice you receive - Christ. Not the human in front of you. During Mass the priest does act in persona Christi, but you don't go to Communion for the man, but Christ.
- If your conscience is bothering you I suggest you take this to confession or spiritual direction. It is not a major matter, but their guidance can help you.
- Scrupulosity in liturgical matters can keep us from truly entering into the Mass, so I am glad to see you have the right attitude about addressing it, but you shouldn't worry about this too much.