ACR FO RPT REGARDING THE MISHANDLING RECEIVED DURING APCH TO DEN. POTENTIAL CONFLICT AND THEN A MISSED APCH AFTER AN EVASIVE MANEUVER. RPTR CITES THE DIFFICULTY IN COM WHAT WITH THE FREQ CONGESTION AND THE CAPT'S USE OF PROFANITY. RPTR FELT THAT ATC FORGOT ABOUT THEIR PRESENCE.

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COS-DEN LEG. ON A SHORT FLT; VECTORED FOR VISUAL RWY 35R; DEN. WHILE ON A 310 DEG HDG AT 10000 FT; IT APPEARED APCH FORGOT US. THE RADIO WAS VERY BUSY. I REQUESTED LOWER FOR 2 REASONS: 1) A REMINDER TO ATC OF OUR PRESENCE. 2) TO GET THE AIRPLANE IN A BETTER POS FOR THE APCH. APCH TURNED AN ACFT ON A BASE LEG TO RWY 35R ABOUT 2 MI IN FRONT OF US. THE CAPT BEGAN VERBALIZING LOUDLY IN CUSS WORDS HOW THE SPACING WAS NOT GOOD. I DON'T KNOW IF WE HAD YET BEEN 'CLRED THE VISUAL' YET OR IF WE WERE ON A 310 DEG HDG STILL; BUT SOMEHOW WE VEERED INTO RWY 35L FLT PATH. WE HAD A TCASII RA ON AN ACFT ON APCH TO THE L. THE CAPT FOLLOWED THE RA (TO CLB); THUS PUTTING US IN A WORSE POS TO RWY 35R. I INFORMED APCH AT CAPT'S REQUEST THAT WE WERE FOLLOWING AN RA. APCH THEN CALLED OUT THE TFC TO THE L AND TOLD US TO CONTINUE FOR RWY 35R VISUAL. SPACING WAS TIGHT ON ACFT IN FRONT OF US. CAPT TOLD ME TO ASK FOR S- TURNS. APCH APPROVED THIS REQUEST. CAPT WAS UNHAPPY AND CUSSING LOUDLY. RADIOS WERE STILL BUSY. APCH CALLED 2 TIMES THAT I HEARD; BUT OTHER ACFT STEPPED ON THE CALLS. ON THE THIRD ATTEMPT FROM APCH; CAPT REPLIED THAT WE WERE GOING AROUND. WE WENT AROUND AND LANDED UNEVENTFULLY. ATC WAS PRIMARY CAUSE OF PROB BY VECTORING US TOO TIGHTLY SPACED WITH PRECEDING ACFT. CAPT CUSSING LOUDLY AND CONTINUOUSLY COMBINED WITH A BUSY RADIO COMPLICATED THE SIT.