The only problem from gambling that i have is a sometimes hard to catch my breath but this only happens if im really nervous and angry so that dosent happen often but when it happens its a little hard to breath. Also sometimes i get headaches but that lasts for a small period
I remembered a time I bet, it was soccer, when the match has started, I was not feeling good at all, I did not watch the match but I just checked its livescores. When I checked the score, my heart was beating faster, this do happens to me before, it will happen when I use big amount of money that I can not afford to lose to bet, but right now, it has changed. Even my breath can no more be affected unlike before because I reduced the amount i.am betting with.
But these feelings we talked about are just normal and usual to people that risk high amount of money to bet, but the changes the OP is talking about deals more with health issue.
Let your mind play the game, not your emotion, otherwise, you will just lose because you are prone to making a bad decisions.
The basic principle of gambling which is to gamble what you can afford only has to be practiced if you want to be on the safe side.
Most gamblers who are addicted are those irresponsible gamblers, they think they can easily win and they risk more than they can afford to lose, as a result, they lose a lot of money and they were addicted because they keep chasing their losses.