Anxiety

So my dad recently cut me out of my life and I’m pretty sure it triggered my anxiety and I can’t stop thinking about how I might leave my boyfriend or like what if I cheat on him or what if I fall out of love like I would never cheat and shit but my head is just spinning the fuck out of control. And it’s too the point where I would just rather die than deal with my mental illnesses. Because it’s so horrible. My boyfriend is the most important thing to me and I feel so guilty for thinking these thoughts even though it’s just my mental illness and it’s driving me insane and I can’t stop thinking about it. Please help with some anxiety coping ideas. My counselor said I’m having sick bad anxiety because my dad abandoned me and that’s why im having doubts but I can’t seem to keep it under Control