do you go to a clinic or a hospital to get tested?

Yes. They will need to take some blood to check.

Keep in mind that in its early stages dengue cannot be detected by a blood test and you're likely to be sent home with instructions about how to reduce the symptoms.

When I had dengue the early stages didn't feel like anything more than a mild cold or hayfever, but when the fever hit it did so very quickly and viciously, when I sat down for dinner I felt a little unwell and didn't really feel like eating, 15 minutes later I had a fever and was unsteady on my feet, a bit over an hour later I was being admitted to hospital with a temp of over 40c, hospital was my home for two weeks.

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I've only been seriously ill twice in Chiang Mai in the last 12 years. Both were from mosquito bites. Blood tests determined that it wasn't dengue but a related illness (and much less serious.) I still felt horrible each time for about 4-5 days.

i have some symptoms but not all so will see how i go, just wanted to know where to go if i feel worse, thanks

Be careful about taking medications. I self-medicated using ibuprofen as a pain reliever and was later told that was the worst possible drug I could have taken. The person giving me this advice was in the medical field but not a doctor, so he may have been wrong.

You can get test as early as Day 1 on dengue. It's antigen test, the antibody test, which has been using for decades can only be tested around day ~4 onwards so if you have all classic symptoms you may get tested at any hospital like Ram Lanna Sriphat they typically offer this rapid test, a CBC would as well be a good idea as it will show your platelets level which is an important indicator of how severe the disease could progress. Eventually dengue or not, hydration with electrolyte/ Gatorade and immune booster with high dose vitamin C is an early &wise step to take care of yourself.

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Reliable information about dengue

Here

http://www.mayoclinic.org/diseases-conditions/dengue-fever/basics/definition/con-20032868

When I had dengue the early stages didn't feel like anything more than a mild cold or hayfever, but when the fever hit it did so very quickly and viciously, when I sat down for dinner I felt a little unwell and didn't really feel like eating, 15 minutes later I had a fever and was unsteady on my feet, a bit over an hour later I was being admitted to hospital with a temp of over 40c, hospital was my home for two weeks.

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I forgot to add one other symptom I experienced, a constant headache that lasted for more than a week, it wasn't intense, just constant. I have a neck injury that causes occasional long term headaches, so I didn't really take too much notice, until the dengue hit, then the penny dropped.