Well how is the view up there? I think you are just tired. Get some sleep & give you attention to something else. you can't speed up the results you are expecting from spiritual work.
This is bad advice, but sometimes you can't dismiss the relief that comes from the "Pleasures" of life. Ganja killed nobody.

Your question is about grounding but as well about your headache so I'll try to answer both with ways of dealing with them, since the main part is grounding I'll start there.

We have ways in Reiki for grounding but I would like to give answers that will benefit the most people I could.

Siting on the floor with your heads on the ground or no your knees is good. Laying on the floor is another way of grounding. Placing your hands on a tree is another as well as hold a rock not a crystal but a rock. All of these are very good for grounding, back to trees we can sit with our backs against the tree and be grounded or standing hugging the tree (ooot ooo he's talking about being a tree huger here! lol) It is grounding even though if you do it most will think you are a weird hippy so best not being seen hugging a tree by public if possible. lol All of this is grounding but as well we can use earthly music with streams or rain maybe birds chirping. We can also eat chocolate or red meat, this is grounding as well. Then there is the harsher ways to ground listening to rock music heavy metal or something like that that is not very spiritual that will ground you fast.

Now for the headache think of the egg shape aura around our heads now imagine this like silly putty you can stretch out, pull on it stretching it out more and more all this condensed energy. Keep pulling it out from your head farther and farther and this can be a very good technique you need no special training and anyone can use this.

Another way is to see the pain as red, and then imagine you direct the pain down your body and out your heals into the ground like millions of red arrows. Or you can sweep with your hands down your body from your head to your feet and into the ground, this is quick and the hands are about an inch from the body for smoothness and easy motion. Breath in with the hands at the top of the head, and breath out as you sweep down to the floor in a quick throwing off motion, like there is something on you negative and you do not want this thing it disgust you so you sweep it off your body into the floor to be rid of it.

Here is a little story for you. It is not an answer, but a test, and if you are able to follow the instructions, you will find your answer, and you will be grounded, and you will not even remembered that you had an headache.

The lady said to her maid, get me two black birds, and put them in a cage, and bring to me. I will feed them, care for them, and talk to them for six days. I will tell them every thing about me, and I will not lie to them. On the seventh day, I will set them free to go back to their way of living, and I will return to my way of living. The two birds flew north, but the next morning, when she went out to her garden the two black birds were still in their cage. The end. What do you think this story means?