alcohol is known to cause gastric irritation. mental confusion which is a sort of stress again leads to gastric problems,once u r not eating well it leads to weakness.
shortness of breath cud be due to old asthma exacerbation,stress or rarely due to long term complication of alcohol abuse.i wud like to knw more before commenting on this.
Next Steps
stop alcohol ,eat sm easy digestible food like daliya or khichdi fr few days,,fruits cn be of great help. follow this routine fr one week at least so ur tummy gets time to settle down.
Health Tips
include exercise if possible in ur routine and stay healthy. u shud take vitamins B1(Thiamine) as alcohol is known to decrease its level which do related to cause weakness and mental confusion .