Injury-plagued says he would give away all of his wealth to be able to play regularly for again.
The German forward is on the comeback trail once more having suffered a cruciate ligament tear back in May.
Reus's career has been beset by injury problems and they have taken their toll both mentally and physically for the 28-year-old.
He told GQ: 'To be alone, working your way back is the most demanding part. I was really fed up after three weeks.
'It's a brutal mental test because you always have to work on your own.'
And despite the huge financial rewards he has gleaned as one of the world's top players, Reus would give it all away to stay fit.
'As top players, we earn a lot of money, but sometimes we pay a hefty price with our health.
'I would give away all the money to be healthy again, to be able to do my job. To do what I love: to play football,' he added.
The rehabilitation plan is on track but Reus is still likely to be out for around another four months.
Having joined Dortmund in 2012 from Borussia Mongchengladbach, the deadly attacker has terrorised defences and his own body proved to be his toughest opponent.
Both Dortmund and Germany fans will be desperate for Reus to return for the long haul and put his injury heartache behind him.
-DailyMail