Hi, This Morning I Ate Cereal In About One Cup

Hi, This morning I ate cereal in about one cup of milk. About 30-45 minutes later I started to get nausea. Then throughout the day I got gassy and bloating feeling in my stomach then later in night I had pain in my stomach, the kind of pain that happens before a diarrhea but when I went to the bathroom there wasn't any diharrea instead there was something like clear and bloody on the toilet paper. Could that be related to milk? I've been eating salad for a week too and also I'm taking enzymatic therapy DGL ultra extra strength digestive relieve chewable tablets.