In research: https://pubmed.ncbi.nlm.nih.gov/35582622/
In media: https://nypost.com/2022/05/05/fda-restricts-jjs-covid-19-vac...
I'll be generous and suggest that your doctor misunderstood your question. VAERS is a nationwide data collection program being used to collect evidence for the adverse effects of these vaccines, including heart problems and blood clots. Your doctor is certainly aware of this program and if they are dealing with covid patients they are most likely involved in collecting and sharing their own observations and data as well.
> blood clots became a concern starting in April 2021, when the government put a pause on the J&J shot after six women who received it developed rare blood clots—and one died. All of these cases were reported to the Vaccine Adverse Events Reporting System (VAERS), a national early reporting warning system to detect safety problems with U.S.-licensed vaccines. (https://www.yalemedicine.org/news/coronavirus-vaccine-blood-...)
Data on the problems the vaccines might be causing is continuously being collected and evaluated. Researchers all over the globe are exchanging data on every facet of this novel virus and the new vaccines we've developed. The possible risks of these vaccines are not being ignored and research is not forbidden. If people are telling you otherwise, you might want to ask them to clarity their position or you may want to reevaluate where you've been getting your information.