We recommend that you immediately contact a physician. Please call 1422 (for Thai citizens) or 096-8478209 or 092-7260474 (for foreigners) between 8am and 8pm.
You need a test as soon as possible.
You can take an online appointment here.
Based on your answers, your condition does not seem concerning. There is no emergency for a test in your case but you can still take an appointment.