I didn't know you already posted there

First question...
Are you diagnosed with Parkinson's? Your post is a little vague about that.

second:
How do you know you are low in dopamine? What was the test you had done?
And what kind of doctor did this test for you?

third:
How did the tyrosine help you...in what way?

Tyrosine is a very plentiful amino acid in food. Typically people are not "low" in
it, unless you don't eat dairy and meat.

So I can answer you better if I know what you are trying to accomplish.

I am sorry, I don't know about Mucuna-- some of the PD members here know more than I.

This website is very good, by Dr. Sahelian MD.
It discusses side effects, and your pressure at the sternum may be a symptom of high blood pressure.
Most of the people writing into this site, find usefulness in doses below what you are taking.
http://www.raysahelian.com/tyrosine.html