Tremors in limbs. Worsen with age?

Hi, I used to get tremors in my limbs during my teenage coupled with confusion. During my 20s these tremor went away on its own. I am 38 right now and I have been experiencing these tremors again for last couple of years. Please note the following important details: 1. Tremors can affect any of the limbs and lasts for 10-15 seconds. 2. Tremors have been changing the patterns. Earlier there used to be confusion but now there is no confusion and I am well aware when it's happening. 3. I didn't notice any particular activity or state when this happen. It can happen anytime. 4. I got my CT scan and EEG done but nothing came in the reports. 5. Neurologist said not to worry but I am not satisfied. Can this lead to Parkinson in the older age? Or can the tremors worsen with age? 6. No head injury I can recall of. Please advise. Thank you.