Reinvent, this might help your cat. I havent used it, but my son used it on his Burmese XSiamese cat with excellent results. I thought about using it, but Im fairly certain, and from what vet said that due to my cats age, she either has diabetes or thyroid disease or both. She eats non-stop because of it.
Really, I think you should try this.
https://www.petcircle.com.au/product/feliway-diffuser?iv_=__iv_p_1_a_1493304239_g_57983963912_w_kwd-372573748757_h_9072020_ii__d_m_v__n_g_c_285425041111_k_feliway diffuser for cats_m_e_l__t__e__r_1t1_x__y__f__o__z__i__j__s__vi__&gclid=CjwKCAjw_b3cBRByEiwAdG8WqlYCftWGFi5Tuv1esWIz7YexGUlBkJBQgSFopUK-cMfPU47s33m6PRoC1JQQAvD_BwE