33 yr old male. Cardiac cath 2 yrs ago showed plaque in arteries but no blockages. Having Symptoms now. Could I have blockage this young?

It is possible. Since you have plaque on cath then it is possible to develop a blockage. You should see your doctor.
Yes. Although we think of heart disease as something that affects people wo are a little older- it can also affect people your age. Please be seen ASAP and best of luck!