My significant other has had a resting heart beat of 104 on three different doctor visits.

He doesn't do drugs and has cut down his caffenine intake. He has seen a family doctor, a neurologist, and internal medicine doctor due to his dizziness & weakness he has had for the past 2 months.

He is 30 yrs old. He had a ecg w/weather strip? That's what first noticed it and on his other visits he also had bpm 104. He was very relaxed and almost asleep the 2nd time so I know it's not anxiety. He was on rhemeron for the past 3 weeks (anti-depressent) but was told to stop taking it by his new doctor & also neuro because it could make dizziness worse. His blood pressure was also on the low side.

My question: is this something that should be looked into deeper, or is 104 not very high? No one seems to be making a big deal out of the heart rate.

does he exercise?

He is in very good physical shape. Has high endurance, does a physical job 8 hours everyday. But, no he doesn't exercise, just what he gets from his physically demanding, fast paced job that involves lifting heavy things.