Dear Blini,
Your experience of sensing less when you Reiki is similiar to my experience: the degree of sensations that were felt as a newbie to Reiki are not the norm now & I have been at level 3 for several years. In the beginning, those sensations made it easier to believe that the energy was flowing, that I could "do" Reiki. I wonder if this is just our Ego rising to the bait of Reiki while our Higher Self just sits quietly smiling, knowing that in the end the Ego will become less forcefull in our practice. Somewhere along the way the knowledge that the energy was always there settled in. There was a time during training when I could not feel much & what helped was this: A RM that was instrumental in the learning process had some sort of personal crisis & couldnt feel anything but boy were his hands hot when he Reikied us. He was one of the best, in the eyes of the recipients, as far as treating & relaxing even without his own awareness of the energy flow. He could not believe that at the time & in his eyes we saw his doubt & sensed his feelings of failure. That demonstrated that Reiki flows even when we do not sense it & a RM can lose touch with what he/she was taught & has lived. I went through a period when I could not sense anything ( between level 2 & 3) & found that relaxing into that & accepting it helped more than struggling with the fear of not being in touch with the energy or a sense of failure. Now I do not feel what I felt at level 1 & 2 but my intuition leads me more & I cant describe that very well except to say it evolved & as sensation decreased intuition seemed to increase. So I do not believe that your experence is unusual at all.
If you have ever felt pain intensify during a Reiki treatment it can be extremely uncomfortable & pain at the heart area must be rather frightening if you have heart disease. I do not know why pain intensifies so that it is unbearable, my guess is that there may be some resistance with dealing with the issue at the bottom of it all or it is long standing & not going to resolve easily & perhaps the peeling away of layers will be more likely to work. Could be a result of more energy than usual being released or a deep need being expressed for healing ( some say it is drawing more energy)? But maybe sometimes it means that enough is enough, please, go away. That conclusion comes from hands on experience as well as personal experience & I stress that because my experience & conclusion does not mean it is a fact or a truth.
Heat & cold are manifestations of energy but perceptions of temperature differ from person to person. So each team ( recipient & practitioner) may have different perceptions of energy flow. When you are treating family members it is sometimes more of a challenge to let the family member direct the healing.
Why? Why? Why? We all ask this, dont we? All anyone can give you is their thoughts & experiences & opinions. Listen to yours and let it take you where you need to go. Why are you asking if 10 minutes of Reiki helped at all? Focus a bit on that question.
Forgive my impertinence here, my "feeling" is that you are being asked to trust your husband to make decisions for himself no matter what you feel or do not feel. Your husband may be asking you to let him deal with it in his way & in his timeline.
Perhaps a skeptic husband who lets you Reiki him is a man who loves his wife very much and/or experiences more healing than he acknowledges? :)
peace & joy,
holobon