/Sometimes, even though I concentrate on my heart, my head pulls down energy and I can't seem to stop it, and I just end up with a headache. Is there any way I can get back to the heart?/
The pain that you are feeling in your head is the result of resistance. What is happening is that your heart is receiving through the mind. Something is coming from above and is trying to enter into the heart, but the mind is not allowing the heart to receive fully. The mind allows the heart to receive to some extent; that is why the force is coming through the mind. But then the mind becomes jealous of the heart and it starts resisting.
At that time try to feel that inside the heart there is something which is infinitely more powerful than the mind. It is the soul, which has immense power. So bring forward your soul's inner strength and say to the mind, "You allowed me to remain quiet for a few minutes, and I am grateful. But I am still praying and meditating, I am still crying for peace, light and bliss, and now you are not allowing me to continue." Then just grab the mind and pull it into the flood of the heart.
The mind is like a naughty child. Previously it was asleep, so the mother was able to remain silent and pray to God. But now the child is awake and it wants to cause mischief. It does not want to allow the mother to aspire any longer. So what will the mother do? She will threaten the child and say, "I am still praying, I am still meditating. You must not disturb me, or I will punish you."
As long as the mind allows you to meditate, you do not have to worry. But when it starts bothering you and creating pain, that means that it does not want to allow you to receive more peace, light and bliss from above. So you have to use your soul's power and pull it into the heart.