Obstacle 
To dream of an obstacle may symbolize an unconscious message to stop and evaluate your situation before continuing on your current path.
There is an implication of turning back - you may fear your future or seek another way to approach a current problem.
Calluses
To dream of a callus indicates a pressing need to clear the mind. There may be a situation in your waking life that calls for clarity and a new way of thinking. Dreaming of calluses on your right foot suggest a fixed and outdated perspective that could be holding you back from a joyful move forward in life. Dreaming of calluses on your left foot imply an unhealthy expectation of another person and the need to bring the focus back to yourself so as to resolve unnecessary baggage.
Hazelnut
A hazelnut in a dream may be telling you not to judge based upon outside appearances. Eating hazelnuts in a dream represents obtaining rewards which have come from an unexpected place.
Adversity
To dream that you are experiencing adversity means that you will experience defeat and enduring misfortune.
To dream of others enduring adversity means that someone close to you may be met with some malady.
Key Chain
To dream of a key chain is a symbol of opportunities about to become available to you. Note the type of decoration on the key chain - a sentimental object may mean the opportunity to succeed with a close colleague or family member.
Dreaming of a key chain dangling in a lock suggests a sudden surge of courage and the prospect of exciting adventure.
Woodpecker
To dream of a woodpecker is a representation that some part of your walking life has been overlooked. The woodpecker represents diligence and industry.
Affliction
To dream that you are enduring an affliction of some kind denotes a potential catastrophe heading your way.
To dream that an affliction affects others, you will be enveloped by bad fortune and possible anguish.
Difficulty
To dream that you are having difficulties suggests that you have endured some isolated and short-lived humiliation. There is the prospect of poor health.
To dream that you are having difficulties with your lover indicates that you will enjoy a forthcoming romantic encounter.
Jawbreaker
To dream of a jawbreaker denotes an appealing prospect that would later prove to be difficult to control and easy to mishandle.
Headlights
Headlights in a dream indicate an approaching problem. You may see warning signs in your daily life which have caused you to fear an impending conflict.
To be caught in the headlights in a dream means that you are feeling vulnerable to a problem which appears unstoppable. This may also indicate a fear of being under the spotlight such as an upcoming speech or an important exam.