If you have just been sad after being fired and lying around instead of exercising that might make the asthma worse but the wrong type of exercise can also trigger it
So before you give up you should find out what type of exercises help with asthma and at least try that if you have stopped exercising lately
An Asthma specialist might be qualified to inform you of lifestyle changes or exercises to improve the situation
But I am not qualified to do that so I am not going to