My name is XXXXX XXXXX I'm a biologist with a special interest in pet health. I have raised guinea pigs and rabbits for over 30 years. I'm sorry to hear of Luis's problems.
This is not normal behavior. While there's no way to be sure based only on an online description, The tilted head, turning in circles, and disorientation point to vestibular disease, also called head tilt, torticollis, or wry neck. This is a complex and serious illness, but it can be treated successfully in many guinea pigs.
Vestibular disease can originate in either the ear or the brain stem. There are many things that can go wrong in these structures that will cause the symptoms you are seeing. There are protozoal infections, bacterial infections, strokes, tumors, and injuries, to name a few. You are going to need an experienced guinea pig vet to figure out exactly what is going on and begin an appropriate treatment. Here is a link to a directory of guinea pig/rabbit vets:http://www.rabbit.org/vets/vets.html
The sooner treatment begins, the better the prognosis, so if you can make an appointment today, that would be best. In the meantime, put your guinea pig in a place where he'll be safe. It's easy for an animal with this condition to injure itself, so place padding on the bottom and sides of his enclosure. Put his hay where he can reach it, and block off or remove the ramp. you don't want him climbing in this condition. You may need to hand feed him and give him water from a syringe if he's unable to eat or drink. The following sites will tell you about vestibular disease, including how a vet may treat it, and what you can do at home to increase your guinea pig's chances of recovery. The sites are geared toward rabbits, but the same information applies to guinea pigs.http://www.rabbit.org/health/tilt.htmlhttp://www.barbibrownsbunnies.com/ecuniculi.htm
The dry spots under Luis's eyes may be the result of watery eyes in the past, or they may be a fungal or bacterial infection. You can place a little plain Neosporin on them.However, since Luis needs to be examined by a vet anyway, I would ask about these at the same time.
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