Hi Maureen,
What you are describing as happening to you could well be a symptom of not closing down properly, which is what I sensed with you.
When we enter any period of psychic activity, our chakras are "open". Our chakras provide the portals through which energy flows and if you don't learn to close them down after use, you can leave yourself vulnerable to unwanted psychic activity.
It's important that you visualise your chakras closing after any period of activity, even if it's after a quick reading for someone.How an individual chooses to close down is very much down to individual preference. For me, I always imagine a white light coming down to protect me(see my earlier post about healing and use this process, in reverse, to protect yourself).
I said to you that I picked up high levels of energy from you, and I am "across the pond" as it were. Energy travels in different frequencies, so if I can pick it up, so can other forms of energy.
Practise closing down after each session and hopefully your unwanted visitors will take the hint, and leave!
Best of luck.
Denise