I Have Been Sober For 3 Years And I Relapced

i have been sober for 3 years and i relapced i am having chest pains tingle sharp pains in my feet and hands, also a fever sometimes, a little back pain and my calfs and feet are sore hands feel tens right upper arm press, i did intrevanisly use. so i was wondering if it is a blood clot or a heart attack. please dont judge me