Hi Anja ,
CBD oil is quite good as it calms you down and is supposed to help with pains too so you might benefit from it . When are you flying to Poland ?
To be honest ,if you haven’t had an upset stomach yet ,i don’t think you will . It usually starts within 24 hours and lasts a few days .i had stomach problems for about 6-7 months but it’s ok now . Do you get restless legs at night time ? I think that was the worst of the withdrawal symptoms for most of us here . Maybe try to buy Sominex to help with the sleep ? You can get it at any chemist and they are quite good ????