Chemar is very correct.

One thing that lay people think is that by taking a drug that is supposed to increase serotonin in the brain (like 5-HTP)...it actually increases serotonin EVERYWHERE. Over 90% of the serotonin actions are NOT in the brain but in the body all over. Serotonin syndrome therefore is a real situation where you have disturbing symptoms in the BODY, not so much in the brain. Some common foods are high in serotonin-- pineapple and bananas are examples. And some common OTC cold products containing Dextromethorphan, can interact with serotonin stimulating drugs or products.

The tyrosine you mention, will increase heart rate, and some people get chest pains from it, or a "feeling of doom" in their chests. We get some people visiting here with tyrosine side effects like this.

So it is very important to go slowly, and seek medical support if possible. Some doctors will test for neurotransmitters, but that only represents, the body, as the brain may not reflect the body's levels. Usually these doctors call themselves, holistic or integrative. Typical doctors don't do this sort of testing as a rule.