The symptoms that you describe are commonly experienced by people in many parts of the world. Yes, the symptoms can be attributed to anxiety. There are three possible conditions that come to my mind immediately:
First, is that of thyroid gland abnormalities. Sometimes, persons with excessive thyroid hormone may report feeling anxious and restless. Typically, they may have some hand tremors. The thyroid gland in the neck could be enlarged. Given their increased metabolism, they often report feeling warm and oftentimes prefer to be in air conditioned places. The doctor will usually order a blood test to check the thyroid hormone level.
The second condition that comes to my mind is that of adjustment disorder with anxious mood. This happens in people who experience something stressful in their lives (e.g., school exams, passing of a relative, adjusting to a new job, enlistment for national service, a divorce) and go on to have symptoms of worry and tension. You can seek treatment from a counsellor who can then teach you relaxation techniques and explore with you your previous coping strategies and see how you can deal with the current challenges and life situation. A psychiatrist can also help you in this way.
Third, generalised anxiety disorder (GAD). In such cases, the individual has anxiety symptoms for at least 6 months. Typical symptoms would include poor sleep, constant worrying and tension in the body. The content of the worries may change, depending on the life situation of the person. For GAD, the treatments that are commonly employed in Singapore include cognitive behavioural therapy (CBT, a form of talk therapy and medications (including SSRIs). I notice that you are 16 years old. Some doctors may have reservations about using SSRIs in a teenager as there are reports of increased suicidal ideations in some cases following initiation of SSRIs. So the best treatment in your case if you have GAD may be CBT.
Do go ahead and see your family physician for an evaluation. It is important to take care of your own mental health.
