Uncomftorable Blockage

I'm looking to get a little insight.
I went and had a reading/Reiki treatment done today.
I practice meditation a lot and have felt a lot of blockages. When I went to this reading today, it was pointed out that I do in fact have a lot of blockages. Especially in the heart chakra.
Said person mentioned it was almost like I was hiding my heart. This is true. I swore at one time I would never feel again. Problem is that those words stuck with me and still ring true, even though I wish they wouldn't. I have a hard time feeling emotions. I know when I'm happy and sad, but it's not a defined feeling, rather just a knowing.
What stumped me the most was that the said person could not do a full reading on me. Rather they were getting bits and pieces because there was such a thick wall up. It was said that it's almost as though I have an extremely thick haze around my aura that's really hard to get through.
I'm not a negative person by any means. I would like to think that I am quite happy and I think happy thoughts and focus on positive energy within myself and others.
I was wondering if anyone knew of a way that I could teach myself to let me walls down, as well and reverse the words that have stuck with me.
I don't know how to.
Any insight would be greatly appreciated.