I would add to the previous interesting advice, the following while doing reiki or meditation. To get into a meditative or relaxed state if it's hard to keep your mind from thinking its good to breathe in and exhale while you mentally repeat a mantra or the reiki symbols, for ex.: breathe in while you mentally say CHO, exhale while you say KU inhale while you mentally say REY. Remember to breath deeply and slowly and do belly breathing (fill in you belly and then when you cant draw anymore air in, fill your chest. When you exhale bring down your chest and then your belly sink it in.) This is a breathing technic to relax that physiotherapist teach.
You focus on the mantra and that keeps you from thinking anything else and helps you get into a deep meditative, relaxed state.
Regarding your wife, I'm sure if she likes to be around you is simply because she loves you. I suggest you tell her you need your space and it is important to you to be able to do your meditation and healing. You can invite her to do healing and meditation also so she can understand the process, and enjoy the healing together. Or if you need time alone, tell her it's important for you to be alone with yourself because you need it. Things are much easier when you explain yourself, that way you give the other the opportunity to understand what are your needs. When you intend to relax tell your wife, so she knows not to bother you for the time you wish to be "connected"

to the divine source.
My husband doesn't do meditation but he NEEDS to be alone. When he comes from work the last thing he wants is for me to start talking to him about my day with the kids and I need to talk as I've been with the kids all day and I'm a stay at home mum and it's a way to let out he tension. But I have to understand that he wants to chill out and relax. So I talk for a bit and leave him alone so he can relax. It might just be reading the news or watching what ever he wants on TV. You know you have to find what works out for you two, OK?
I'm sure she will understand. She will either join you in meditation or let you your little space. We all need our little space.
As a wife, maybe she wont take it to good if you go off on camp with mates. I'm sure you know what are your likes and dislikes in these matters.
The same as venuslove is an empath maybe that could be your case also. Or it's just the world we live in that is full of stress and it's hard to disconnect yourself form all your responsabilities and must dos. Set all that aside and just think in present.
A wonderful quote from Ku Fu Panda which is a principal not to forget:
The past is history, the future’s mystery, the present is a gift – that’s why it’s called the present. ...