Studying iridology

Q: I would like to enquire if it is permissible to study a diploma in Iridology. It's got to do with diagnosing conditions by looking into a persons eye to detect nutrional deficiencies and conditions etc. Please advise if Iridology is permisible within shariah especially when it comes to our Aqaaid.

Assuming the worst in any situation

Q: Recently, I realised that I think catastrophically. I always assume the worst and anticipate the worst situations which never occur.

I know this bad habit did not appear suddenly, but I had some really bad experiences that came out of the blue which caught me offguard. Now, this habit in the way I think is affecting my life.

I am only 19 and I feel this habit is creating destruction within my home and I fear that it will affect my future even more.

How can I remove this negative way of thinking? 

Missing salaah due to shopping

Q: I offer salaah regularly Alhamdulilah but I had a few questions in this regard:

1. Although I don't do hijab but whenever its salaah time I feel restless to pray. I am married and prefer to go out only after magrib so that I don't miss salaah but my husband says it's ok if you miss a salaah for which you can offer qadha later as my urge to pray sometimes causes hurdles in schedule of shopping or doing grocery shopping. Please advise on this.

2. I work in a school and offer Zuhr Salaah during working hours. Is it okay if I do the fardh of wudhu only and offer 4 fardh of zuhr only. Kindly advise on this.