I get too overwhelmed in meditation

So, I've been trying for 6 years now and something that only recently been happening to me is this: I go to meditate and I began to follow a tip from a fellow shifter to focus on the forms and colors that we see when we close our eyes. When I do that, I feel too alert. I don't know how to explain it exactly, but I feel overwhelmed. I don't know why it only happens when I try to focus on my eyelids when meditating. Anyone feel this way, too? Anyone can give me tips?