Coming from somebody that's been dealing with a shoulder injury for the better part of 4 years now, depending on what's wrong, I might seek out a sports rehab therapist.  They have these bungee cord things and a bunch of exercises you can do to strengthen your shoulder muscles.  The clicking/popping/crunching might just be hardened cartilage, cause I have that in my knees.  When I started bowling this summer, my shoulder would hurt so bad it would take me 3 games just to warm it up, so I switched hands for the summer, and now I'm bowling pain free for the first couple weeks of the year so far, and at 3 leagues a week no less.  I've tried Advil, and I've also tried alcohol . . which both work well, albeit Advil is a lot cheaper.  Unless you normally drink a lot anyway, in which case I'd say to stick with alcohol.  Don't want to insult your intelligence, but I wouldn't recommend a combination of the two.
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This is Fluffy.  He is the Destroyer of Worlds.

As an expert in Sports Medicine and a fellow bowler my advice to you is to seek out a medical professional for the shoulder pain.  I'd try your family physician first, he/she may refer you to an orthopedic physician for further testing.
Pain is your body telling you there's something wrong, and you should listen to it.
Anti-inflammatory's like Advil (ibuprofen) or Aleve will probably take some of the pain away, and it may be part of the treatment, but it's really only covering up the real problem whatever that might be.
One question I would have is, do you do any strength/weight training?
It's probably the one thing bowlers need to do more of if they want to stay healthy.
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titletowncards

Meh, I dislocated mine, try to avoid that one lol . .

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I should do strength training but I don't,which I should do with my wrist/forearm which is pretty weak and my knees as I have instability due to poorly developed/distributed muscle.Its like a lot of things,we say that we will start tomorrow,however as the saying goes "Tomorrow never comes".

I think part of the problem might be that I try to bowl after having very long periods of inactivity. One thing I would like to mention is that before the problem stopped me from bowling,I had a couple of weeks whereby I was sometimes lying in bed and I would get a short/sharp burst of pain for no reason,which for want of a better description,I would say was almost as if I was about to dislocate my shoulder.
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I would have got away with it if it was not for those pesky kids (Behind my lane) and those blasted 10 pins.

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This is Fluffy.  He is the Destroyer of Worlds.