Good day girls! I wanted to ask how to get rid of milk stagnation? Yes…

Good day girls! I wanted to ask how to get rid of milk stagnation? Yesterday at night while feeding only with the right breast and forgot about the left one. In the morning I wake up from pain in the chest. Today I fed the left breast for 2-3 hours. What should I do, it's really painful and my temp is almost 38((( headache and weakness.