Eye Pain becoming persistent

I finished the 11th round of Chemo last week. The cycle went well, I have got the routine to minimize the side effects down to science. The last think I added was eating cardboard cereal. Actually it was imitation cardboard cereal, a mini-wheat cereal from Trader Joe's. That helped a lot with the poop shooter.

The problem started after the cycle was done. I usually feel better by Sunday night, but not this time. All week I have had this pain in and behind my left eye. It kinda feels like the muscles are constantly fighting to keep the eye strait. This is accompanied by a strange sensation that what I am seeing in that eye is not clear. I can see fine, but I feel something is just not right. Occasionally, I will get a real sharp pain like a cramp in my eye that only lasts a second. I have had pain in my eye like this in the past year, but it would come and go in a couple hours. As of now, this has been constant for 6 days now. This leads to severe headaches, the Tramadol pain medication does not help. The constant headaches lead to exhaustion. 

This has got me really, really worried. The doctor warned of problems like this because the tumor is in the part of my brain that controls and interprets sight in the left eye. I will not make a good pirate, I get seasick very easy.