help please😢

i have always had anxiety and have been a huge worrier and overthinker i havent gotten diagnosed with an anxiety disorder yet, a few months ago i convinced myself my bf of 4 years didn’t love me anymore for no reason at all and it wasn’t true bc that though hasn’t crossed my mind since but for the past week i have had these thoughts pop into my head like “what if were not in love what if we’re just obsessed with eavhother”? that thought passed and now ive been thinking “what if i’m not really in love with him”? for no reason at all i don’t know if i saw somthing on tv or read somthing but then i started to convince myself of these terrible thoughts when i know i am in love with him bc he means literally eveything to me, these thoughts make me cry everytime and make me nauseous😢 he’s literally the best thing that’s ever happened to me if i didn’t love him i’d leave bc were in a long distance relationship so we only see each other about every other weekend and the pain is terrible but he’s worth it, he cane over yesterday and i was so happy when he was here with me. me in his arms and getting to kiss him, eveything was pretty much like normal, but then this morning i woke up and started crying bc i miss him like hell i usually act this way on the day after we say goodbye bc i know i wont get to kiss him or be with him for a while, i miss him so much and now these stupid thoughts are back invading my mind it’s all i can think about and it scares me so much bc just the thought of being without him or mid breaking uo makes me sick, i can’t see my self without him,im constantly researching and find relief for a while bitthen they come back idk what to do it’s killing me inside. has anyone else dealt with this? can it be my anxiety doing this to me? i feel like a terrible person/girlfriend, i feel crazy😢 i can’t stop obsessing over these thoughts they literally just came out of no where