Just Felt Awful At Lunch Like An Elephant Sitting On

Just felt awful at lunch like an elephant sitting on chest am in mid 50s BP was 138/85 pulse 117 on waking after five hours deep sleep pressure almost gone on chest .. Am recovering from flu on augmentin duo forte and it's been a stressful week due to fathers death etc made app for doc in morning .. My pulse usually 80 resting .. What is it likely cause of pressure feeling deep five sleep and waking up withhigh pulse