In my country the law have forbidden the mikve’s use. Also is forbidden go in River, lake or sea.
Is Allowed for a Wife make the tevilla in a long shower?
Our hearts and tefillot are with you in your difficult situation.
Regarding your question. This is big problem because the only way for a woman to be permitted to her husband is by immersing in a kosher mikva, and a shower, no matter how long will NOT suffice. This is a great difficulty, and hopefully the situation in your country will improve and the restrictions will be removed soon. It is a great nisayon, but in this zechus that you are keeping the halachos, H-shem should reward both of you that you should both be safe, and have children that will be talmidei chachamim.