In ideal world everyone would afford the care they need. Myself living in a country where you can choose to wait in a queue for an affordable CT/MRI for a year in a non-emergency case if you are lucky enough to get a referral or pay outrageous amounts to a private clinic I have had to take the choice to go to a neighboring developing country to do the examinations and see specialist for the fraction of the cost. Surely I might feel some unease wondering about the level of the care there (and I often have similar doubts on the care we receive in this country as well. On the other hand that is the care the locals happily settle for for all their lives. The equipment they use are often not bad at all, and a lot depends on the attitude and level of experience of the doctor and how much time he can spend on the patient - which does not depend on the location), but in the end that is at least likely to be better than no care at all.
But as said there may be number of possible causes for your symptoms, so a scan may not resolve the issue, but you need to see a specialist first. If you are in fact unable to afford the care in your home country, you could see into possibilities at other locations. Or if you prefer to be a bit reckless, with the same cost as at home, enjoy a luxury holiday and have a check-up at the same time at some medical-tourist location (heard Thailand is popular).
Buying long-term quality care with a family doctor is still surely the best choice when available.
Well I have to start by saying that you need to see a neuro-ophthalmologist. And you need to see a regular MD for a general physical. You can find an eye MD at www.aao.org
There are a number of things that can cause this some serious (disease of the heart, brain, blood vessels) and some less so (migraine varients some of which have no headache).
It is a false economy not to take care of your health.
JCH III MD