In August, Zurich and Brighton announced reaching agreement for the transfer of the 22-year-old, subject to passing a medical, obtaining a work permit and international clearance.
However, the English outfit pulled out of the deal at the last minute, saying the frontman failed his medical due to a heart condition.
"I am doing very good," Dwamena told KweseESPN.
"If we don't go through certain things, we will never grow.
"I am grateful to God that I went through it and had the power to endure.
"I am back playing, feeling very good and hoping to return to my very best.
"This hasn't changed anything. It is natural that this will play on my mind but I am focusing on just the football and nothing else."
Dwamena was once on the books of Austrian giants Red Bull Salzburg, featuring for feeder side Liefering.
Having joined Zurich from Austria Lustenau in January, a combined 30 goals over the course of last season plus a double in this campaign's league opener has made the Black Star a top transfer target for clubs.